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Derivative and Hedging Instruments - Average Rate of Hedging Instruments in Hedge Relationships That Do Not Frequently Reset (Details) - CAD ($)
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 13,720,000,000 9,808,000,000
Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 29022.00% 29013.00%
Nominal amount of hedging instrument 9,036,000,000 8,372,000,000
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 66.703%  
Nominal amount of hedging instrument 1,471,000,000  
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 56.259%  
Nominal amount of hedging instrument 549,000,000  
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 73.009%  
Nominal amount of hedging instrument 1,639,000,000  
Foreign exchange risk | Fixed rate liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument   93.503%
Nominal amount of hedging instrument   500,000,000
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 650,000,000 650,000,000
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 122.914% 122.914%
Nominal amount of hedging instrument 51,000,000 46,000,000
Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Average rate of hedging instrument 3012.00% 2628.00%
Nominal amount of hedging instrument 324,000,000 240,000,000
Fair value    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets $ 84,000,000 $ 63,000,000
Hedging instrument, liabilities (291,000,000) (229,000,000)
Fair value, net (207,000,000) (166,000,000)
Fair value | Inflation risk | Inflation linked insurance liabilities | Interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 24,000,000 20,000,000
Hedging instrument, liabilities (48,000,000) (48,000,000)
Fair value, net (24,000,000) (28,000,000)
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 16,000,000  
Hedging instrument, liabilities 0  
Fair value, net 16,000,000  
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 22,000,000  
Hedging instrument, liabilities 0  
Fair value, net 22,000,000  
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 9,000,000  
Hedging instrument, liabilities (27,000,000)  
Fair value, net (18,000,000)  
Fair value | Foreign exchange risk | Fixed rate liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets   35,000,000
Hedging instrument, liabilities   0
Fair value, net   35,000,000
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 (216,000,000) (181,000,000)
Fair value, net (216,000,000) (181,000,000)
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 7,000,000 5,000,000
Hedging instrument, liabilities 0 0
Fair value, net 7,000,000 5,000,000
Fair value | Equity risk | Stock-based compensation | Equity contracts    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 6,000,000 3,000,000
Hedging instrument, liabilities 0 0
Fair value, net $ 6,000,000 $ 3,000,000
Less than 1 year    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 319,000,000 598,000,000
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 92,000,000 87,000,000
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  
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  
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 165,000,000  
Less than 1 year | Foreign exchange risk | Fixed rate liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument   500,000,000
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 42,000,000 0
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 20,000,000 11,000,000
1 to 5 years    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 1,563,000,000 734,000,000
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 568,000,000 459,000,000
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 160,000,000  
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 115,000,000  
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 407,000,000  
1 to 5 years | Foreign exchange risk | Fixed rate liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument   0
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 9,000,000 46,000,000
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 304,000,000 229,000,000
Over 5 years    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 11,838,000,000 8,476,000,000
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 8,376,000,000 7,826,000,000
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 1,311,000,000  
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 434,000,000  
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 1,067,000,000  
Over 5 years | Foreign exchange risk | Fixed rate liabilities | Foreign currency swaps    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument   0
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 650,000,000 650,000,000
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