v3.26.1
Derivative Financial Instruments - Summary of Fair Value of DFIs included in Statement of Financial Position (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Net total $ (63,571,866) $ (99,768,509)
Derivatives not designated as hedges    
Disclosure of detailed information about financial instruments [line items]    
Total assets 14,534,464 9,203,958
Total liabilities (78,106,329) (108,972,467)
Net total (63,571,865) (99,768,509)
Derivatives not designated as hedges | Currency options    
Disclosure of detailed information about financial instruments [line items]    
Total assets 162,557 0
Total liabilities (3,760,202) (7,566,249)
Derivatives not designated as hedges | Cross-currency swaps    
Disclosure of detailed information about financial instruments [line items]    
Total assets 14,176,252 9,103,992
Total liabilities (60,628,816) (101,014,985)
Derivatives not designated as hedges | Interest rate swaps    
Disclosure of detailed information about financial instruments [line items]    
Total assets 195,655 99,966
Total liabilities 0 (131,351)
Derivatives not designated as hedges | Forwards    
Disclosure of detailed information about financial instruments [line items]    
Total liabilities (13,717,311) 0
Derivatives not designated as hedges | Crude oil options    
Disclosure of detailed information about financial instruments [line items]    
Total liabilities $ 0 $ (259,882)