v3.26.1
Derivative Financial Instruments - Summary of Quantitative Disclosure of Cash Flow's Maturities (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
MXN ($)
Dec. 31, 2024
MXN ($)
Buy Put, Sell Put and Sell Call on Japanese yen    
Disclosure of detailed information about financial instruments [line items]    
Currency Options $ 9,171,948 $ 10,314,656
Buy Call, Sell Call and Sell Put on euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 8,844,069 41,446,950
Sell Call on pounds sterling    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 11,415,512
Petróleos Mexicanos Sell Call on euro    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 43,262,535 0
Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 17,966,700 83,943,191
Maturity Period One | Buy Put, Sell Put and Sell Call on Japanese yen    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 9,171,948  
Maturity Period One | Buy Call, Sell Call and Sell Put on euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 15,214,703
Maturity Period One | Sell Call on pounds sterling    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 11,415,512
Maturity Period One | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 13,640,769
Maturity Period Two | Buy Put, Sell Put and Sell Call on Japanese yen    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 10,314,656
Maturity Period Two | Petróleos Mexicanos Sell Call on euro    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 14,772,559  
Maturity Period Two | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 15,739,348
Maturity Period Three | Buy Put, Sell Put and Sell Call on Japanese yen    
Disclosure of detailed information about financial instruments [line items]    
Currency Options   0
Maturity Period Three | Buy Call, Sell Call and Sell Put on euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 8,844,069  
Maturity Period Three | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 26,232,247
Maturity Period Four | Buy Call, Sell Call and Sell Put on euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 26,232,247
Maturity Period Four | Petróleos Mexicanos Sell Call on euro    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 26,379,607  
Maturity Period Four | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options   0
Maturity Period Five | Petróleos Mexicanos Sell Call on euro    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 2,110,369  
Maturity Period Five | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 26,232,247
Maturity Period After Year Five | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 17,966,700 2,098,580
Fair Value | Buy Put, Sell Put and Sell Call on Japanese yen    
Disclosure of detailed information about financial instruments [line items]    
Currency Options (2,841,492) (2,612,530)
Fair Value | Buy Call, Sell Call and Sell Put on euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options (311,664) (4,953,719)
Fair Value | Sell Call on pounds sterling    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0 0
Fair Value | Petróleos Mexicanos Sell Call on euro    
Disclosure of detailed information about financial instruments [line items]    
Currency Options (223,737) 0
Fair Value | Sell Call on Euros    
Disclosure of detailed information about financial instruments [line items]    
Currency Options $ (444,490) $ (142,993)
U.S. dollar | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Variable to fixed 0 2,482,867
Fixed to variable $ 14,373,360 $ 18,241,470
U.S. dollar | Buy Cap, Sell Floor on floating in U.S. dollar SOFR 1M | Secured Overnight Financing Rate (SOFR)    
Disclosure of detailed information about financial instruments [line items]    
Buy Cap, Sell Floor on floating in U.S. dollar SOFR 1M $ 0 $ 0
U.S. dollar | Maturity Period One | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Variable to fixed 0 2,482,867
Average pay rate 5.13% 2.31%
Average receive rate 5.35% 5.23%
U.S. dollar | Maturity Period Two | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Variable to fixed 0 0
Average pay rate 4.50% 0.00%
Average receive rate 5.35% 0.00%
U.S. dollar | Maturity Period Two | Buy Cap, Sell Floor on floating in U.S. dollar SOFR 1M | Secured Overnight Financing Rate (SOFR)    
Disclosure of detailed information about financial instruments [line items]    
Buy Cap, Sell Floor on floating in U.S. dollar SOFR 1M $ 0 $ 0
U.S. dollar | Maturity Period Three | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Variable to fixed 0 0
Average pay rate 4.60% 0.00%
Average receive rate 5.35% 0.00%
Fixed to variable $ 14,373,360  
U.S. dollar | Maturity Period Four | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Variable to fixed   0
Average pay rate 0.00% 5.36%
Average receive rate 0.00% 5.35%
Fixed to variable $ 0 $ 18,241,470
U.S. dollar | Maturity Period Five | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Average pay rate 0.00% 0.00%
Average receive rate 0.00% 0.00%
U.S. dollar | Maturity Period After Year Five | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Average pay rate 0.00% 0.00%
Average receive rate 0.00% 0.00%
U.S. dollar | Fair Value | Interest Rate Swaps (U.S. dollars)    
Disclosure of detailed information about financial instruments [line items]    
Variable to fixed 0 46,223
Fixed to variable $ 195,655 $ (77,608)
U.S. dollar | Fair Value | Buy Cap, Sell Floor on floating in U.S. dollar SOFR 1M | Secured Overnight Financing Rate (SOFR)    
Disclosure of detailed information about financial instruments [line items]    
Buy Cap, Sell Floor on floating in U.S. dollar SOFR 1M 0 0
Receive euros/Pay U.S. dollars | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 50,018,064 147,904,655
Receive euros/Pay U.S. dollars | Maturity Period One | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 39,365,746
Receive euros/Pay U.S. dollars | Maturity Period Two | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 13,551,813 22,194,423
Receive euros/Pay U.S. dollars | Maturity Period Three | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 8,040,679 27,221,847
Receive euros/Pay U.S. dollars | Maturity Period Four | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 26,436,838 27,055,647
Receive euros/Pay U.S. dollars | Maturity Period Five | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 1,988,734 29,823,494
Receive euros/Pay U.S. dollars | Maturity Period After Year Five | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 2,243,498
Receive euros/Pay U.S. dollars | Fair Value | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 5,585 (9,396,306)
Receive Japanese yen/Pay U.S. dollars | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Receive Japanese yen/Pay U.S. dollars | Fair Value | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Receive pounds sterling/Pay U.S. dollars | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 11,991,942
Receive pounds sterling/Pay U.S. dollars | Maturity Period One | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 11,991,942
Receive pounds sterling/Pay U.S. dollars | Maturity Period Two | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Receive pounds sterling/Pay U.S. dollars | Fair Value | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 (708,227)
Receive UDI/Pay pesos | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 28,670,492 31,733,673
Receive UDI/Pay pesos | Maturity Period One | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 17,076,001 3,063,181
Receive UDI/Pay pesos | Maturity Period Two | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 17,076,001
Receive UDI/Pay pesos | Maturity Period Three | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 4,749,625 0
Receive UDI/Pay pesos | Maturity Period Four | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 0 4,749,625
Receive UDI/Pay pesos | Maturity Period Five | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Receive UDI/Pay pesos | Maturity Period After Year Five | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 6,844,866 6,844,866
Receive UDI/Pay pesos | Fair Value | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 9,058,137 5,491,946
Receive Swiss francs/Pay U.S. dollars | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Receive Swiss francs/Pay U.S. dollars | Fair Value | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Receive pesos/Pay U.S. dollars | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 36,091,100  
Receive pesos/Pay U.S. dollars | Maturity Period After Year Five | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps 36,091,100  
Receive pesos/Pay U.S. dollars | Fair Value | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps (839,306)  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   110,393,510
Currency Options 16,875,103  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 43,349,310  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period One | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   61,490,994
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period One | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Two | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   48,902,516
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Two | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 21,674,655  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Three | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Currency Options 9,544,149  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Three | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 21,674,655  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Four | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Currency Options 3,844,287  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Four | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Five | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Currency Options 3,486,667  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period Five | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period After Year Five | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   0
Currency Options 0  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Maturity Period After Year Five | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options 0  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Fair Value | FX Forwards    
Disclosure of detailed information about financial instruments [line items]    
Cross-currency swaps   $ (87,155,413)
Currency Options (13,717,311)  
Receive U.S. dollars and pesos / Pay U.S. dollars and pesos | Fair Value | Prepaid swaps    
Disclosure of detailed information about financial instruments [line items]    
Currency Options $ (54,453,243)