v3.26.1
Bonds, notes and other obligations - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jan. 17, 2024
USD ($)
Jan. 31, 2025
USD ($)
Dec. 31, 2025
PEN (S/)
Dec. 31, 2024
PEN (S/)
Dec. 31, 2023
PEN (S/)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Aug. 31, 2024
USD ($)
Feb. 28, 2023
USD ($)
Jun. 30, 2020
Oct. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]                      
Notional amount | S/     S/ 13,275,494,000 S/ 13,070,956,000              
Repayments of bonds, notes and debentures | S/     1,502,749,000 1,266,504,000 S/ 2,189,040,000            
Debt Instrument Redemption Price Percentage                   100.00%  
Three Point Two Five Zero Percent Corporate Bonds [Member]                      
Disclosure of detailed information about borrowings [line items]                      
Notional amount     S/ 1,008,900,000 1,129,200,000   $ 300,000,000 $ 300,000,000        
Six point six two five Percentage Subordinated Bonds [Member]                      
Disclosure of detailed information about borrowings [line items]                      
Annual interest rate     6.625%     6.625%          
Repayments of bonds, notes and debentures | $ $ 194,852,000                    
Borrowings, interest rate basis     since that date, the interest rate changes to 5-year U.S. Treasury plus 365.2 basis points.                
Six Point Three Nine Seven Percentage Subordinated Bonds [Member]                      
Disclosure of detailed information about borrowings [line items]                      
Annual interest rate   6.397%                  
Repayments of bonds, notes and debentures | $   $ 350,000,000                  
Borrowings, interest rate basis     from that date forward, the interest rate will change to UST to 5-year rate plus 206.7 basis points.                
Senior Bonds [Member] | Cash flow hedges [member]                      
Disclosure of detailed information about borrowings [line items]                      
Notional amount | $                     $ 150,000,000
Cash flow hedge, fair value | S/     S/ 505,200,000 565,500,000              
Senior Bonds [Member] | Cash flow hedges [member] | Two Cross Currency Swap Contracts [Member]                      
Disclosure of detailed information about borrowings [line items]                      
Notional amount | $                 $ 20,000,000    
Cash flow hedge, fair value | S/     67,360,000 75,400,000              
Senior Bonds [Member] | Cash flow hedges [member] | Cross currency swap contracts one [member]                      
Disclosure of detailed information about borrowings [line items]                      
Notional amount | $               $ 10,000,000      
Cash flow hedge, fair value | S/     S/ 33,680,000 S/ 37,700,000