v3.25.4
Derivative and Hedging Instruments - Average Rate of Hedging Instruments in Hedge Relationships That Do Not Frequently Reset (Details) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 16,442 13,720
Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 29702.00% 29022.00%
Nominal amount of hedging instrument 10,946 9,036
Foreign exchange risk | Foreign currency assets, CAD/EURO | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 66.285% 66.703%
Nominal amount of hedging instrument 1,676 1,471
Foreign exchange risk | Foreign currency assets, CAD/GBP | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 55.972% 56259000.00%
Nominal amount of hedging instrument 630 549
Foreign exchange risk | Foreign currency assets, CAD/USD | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 72.856% 73009000.00%
Nominal amount of hedging instrument 1,472 1,639
Foreign exchange risk | Foreign currency assets, JPY/EUR | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 0.603%  
Nominal amount of hedging instrument 762  
Foreign exchange and interest rate risk | Floating rate foreign currency liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 86.655% 86.655%
Nominal amount of hedging instrument 650 650
Foreign exchange and interest rate risk | Debt securities at fair value through OCI | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 123.451% 122.914%
Nominal amount of hedging instrument 8 51
Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 3839.00% 3012.00%
Nominal amount of hedging instrument 298 324
Fair value    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets $ 46 $ 84
Hedging instrument, liabilities (451) (291)
Fair value, net (405) (207)
Fair value | Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 31 24
Hedging instrument, liabilities (63) (48)
Fair value, net (32) (24)
Fair value | Foreign exchange risk | Foreign currency assets, CAD/EURO | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 0 16
Hedging instrument, liabilities (80) 0
Fair value, net (80) 16
Fair value | Foreign exchange risk | Foreign currency assets, CAD/GBP | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 0 22
Hedging instrument, liabilities (14) 0
Fair value, net (14) 22
Fair value | Foreign exchange risk | Foreign currency assets, CAD/USD | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 14 9
Hedging instrument, liabilities (4) (27)
Fair value, net 10 (18)
Fair value | Foreign exchange risk | Foreign currency assets, JPY/EUR | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 0  
Hedging instrument, liabilities (100)  
Fair value, net (100)  
Fair value | Foreign exchange and interest rate risk | Floating rate foreign currency liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 0 0
Hedging instrument, liabilities (190) (216)
Fair value, net (190) (216)
Fair value | Foreign exchange and interest rate risk | Debt securities at fair value through OCI | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 1 7
Hedging instrument, liabilities 0 0
Fair value, net 1 7
Fair value | Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 0 6
Hedging instrument, liabilities 0 0
Fair value, net $ 0 $ 6
Less than 1 year    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 161 319
Less than 1 year | Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 107 92
Less than 1 year | Foreign exchange risk | Foreign currency assets, CAD/EURO | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 0
Less than 1 year | Foreign exchange risk | Foreign currency assets, CAD/GBP | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 0
Less than 1 year | Foreign exchange risk | Foreign currency assets, CAD/USD | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 20 165
Less than 1 year | Foreign exchange risk | Foreign currency assets, JPY/EUR | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0  
Less than 1 year | Foreign exchange and interest rate risk | Floating rate foreign currency liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 0
Less than 1 year | Foreign exchange and interest rate risk | Debt securities at fair value through OCI | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 8 42
Less than 1 year | Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 26 20
1 to 5 years    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 1,839 1,563
1 to 5 years | Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 606 568
1 to 5 years | Foreign exchange risk | Foreign currency assets, CAD/EURO | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 213 160
1 to 5 years | Foreign exchange risk | Foreign currency assets, CAD/GBP | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 115 115
1 to 5 years | Foreign exchange risk | Foreign currency assets, CAD/USD | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 352 407
1 to 5 years | Foreign exchange risk | Foreign currency assets, JPY/EUR | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 281  
1 to 5 years | Foreign exchange and interest rate risk | Floating rate foreign currency liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 0
1 to 5 years | Foreign exchange and interest rate risk | Debt securities at fair value through OCI | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 9
1 to 5 years | Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 272 304
Over 5 years    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 14,442 11,838
Over 5 years | Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 10,233 8,376
Over 5 years | Foreign exchange risk | Foreign currency assets, CAD/EURO | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 1,463 1,311
Over 5 years | Foreign exchange risk | Foreign currency assets, CAD/GBP | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 515 434
Over 5 years | Foreign exchange risk | Foreign currency assets, CAD/USD | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 1,100 1,067
Over 5 years | Foreign exchange risk | Foreign currency assets, JPY/EUR | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 481  
Over 5 years | Foreign exchange and interest rate risk | Floating rate foreign currency liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 650 650
Over 5 years | Foreign exchange and interest rate risk | Debt securities at fair value through OCI | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 0
Over 5 years | Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 0 0