v3.25.4
Derivative and Hedging Instruments - Fair Value Hierarchy of Derivative Instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets $ 9,628 $ 8,667
Fair value, liabilities 14,347 14,247
Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 10,367 10,954
Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 3,952 3,230
Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 28 63
Level 1    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Fair value, liabilities 0 0
Level 1 | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 0 0
Level 1 | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 0 0
Level 1 | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 0 0
Level 2    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 9,555 8,500
Fair value, liabilities 14,278 10,845
Level 2 | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 10,307 7,571
Level 2 | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 3,949 3,227
Level 2 | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 22 47
Level 3    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 73 167
Fair value, liabilities 69 3,402
Level 3 | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 60 3,383
Level 3 | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 3 3
Level 3 | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, liabilities 6 16
Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 5,403 5,193
Interest rate swaps | Level 1    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Interest rate swaps | Level 2    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 5,380 5,026
Interest rate swaps | Level 3    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 23 167
Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 3,218 2,742
Foreign currency swaps | Level 1    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Foreign currency swaps | Level 2    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 3,218 2,742
Foreign currency swaps | Level 3    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 1,006 730
Equity contracts | Level 1    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Equity contracts | Level 2    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 956 730
Equity contracts | Level 3    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 50 0
Credit default swaps    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 1 2
Credit default swaps | Level 1    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Credit default swaps | Level 2    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 1 2
Credit default swaps | Level 3    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 0 0
Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Fair value, assets 1,006 732
Fair value, liabilities $ 28 $ 57