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Total Invested Assets and Related Net Investment Income - Reconciliation of Components of Equity (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Balance, beginning of period $ 714 $ 872
Unrealized gains (losses) (11) 42
Unrealized gains (losses) (290) 677
Reclassifications to net income (loss) 28 (53)
Reclassifications to net income (loss) (49) 0
Related tax (7) 2
Balance, end of period 772 714
Currently Stated, Due To Changes In Accounting Policy    
Disclosure of detailed information about financial instruments [line items]    
Balance, beginning of period 161 988
Balance, end of period   161
Foreign exchange risk    
Disclosure of detailed information about financial instruments [line items]    
Unrealized gains (losses) (17) 44
Reclassifications to net income (loss) (37) 51
Equity price risk    
Disclosure of detailed information about financial instruments [line items]    
Unrealized gains (losses) 7 (8)
Reclassifications to net income (loss) 3 2
Unrealized gains (losses) on cash flow hedges    
Disclosure of detailed information about financial instruments [line items]    
Balance, beginning of period (18) (7)
Related tax (7) 6
Balance, end of period (1) (18)
Unrealized gains (losses) on cash flow hedges | Currently Stated, Due To Changes In Accounting Policy    
Disclosure of detailed information about financial instruments [line items]    
Balance, beginning of period (18) (7)
Balance, end of period   (18)
Unrealized gains (losses) on cash flow hedges | Foreign exchange risk    
Disclosure of detailed information about financial instruments [line items]    
Unrealized gains (losses) (17) 44
Reclassifications to net income (loss) 37 (51)
Unrealized gains (losses) on cash flow hedges | Equity price risk    
Disclosure of detailed information about financial instruments [line items]    
Unrealized gains (losses) 7 (8)
Reclassifications to net income (loss) (3) (2)
Unrealized foreign currency translation gains (losses), net of hedging activities    
Disclosure of detailed information about financial instruments [line items]    
Balance, beginning of period 1,689 953
Related tax (5) 7
Balance, end of period 1,350 1,689
Unrealized foreign currency translation gains (losses), net of hedging activities | Currently Stated, Due To Changes In Accounting Policy    
Disclosure of detailed information about financial instruments [line items]    
Balance, beginning of period 1,630 953
Balance, end of period   1,630
Unrealized foreign currency translation gains (losses), net of hedging activities | Foreign exchange risk    
Disclosure of detailed information about financial instruments [line items]    
Unrealized gains (losses) (285) 670
Reclassifications to net income (loss) (49) 0
Unrealized foreign currency translation gains (losses), net of hedging activities | Equity price risk    
Disclosure of detailed information about financial instruments [line items]    
Unrealized gains (losses) 0 0
Reclassifications to net income (loss) $ 0 $ 0