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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance $ 1,704 $ 1,114
Other comprehensive income (loss) (232) 590
Accumulated other comprehensive income, ending balance 1,472 1,704
Unrealized foreign currency translation gains (losses), net of hedging activities    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance 1,923 1,012
Other comprehensive income (loss) (564) 911
Accumulated other comprehensive income, ending balance 1,359 1,923
Unrealized gains (losses) on available-for-sale assets    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance (56) 346
Other comprehensive income (loss) 369 (402)
Accumulated other comprehensive income, ending balance 313 (56)
Unrealized gains (losses) on cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance (21) (11)
Other comprehensive income (loss) 14 (10)
Accumulated other comprehensive income, ending balance (7) (21)
Share of other comprehensive income (loss) in joint ventures and associates    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance (24) (31)
Other comprehensive income (loss) (9) 7
Accumulated other comprehensive income, ending balance (33) (24)
Remeasurement of defined benefit plans    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance (263) (347)
Other comprehensive income (loss) (42) 84
Accumulated other comprehensive income, ending balance (305) (263)
Revaluation surplus on transfers to investment properties    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance 145 145
Other comprehensive income (loss) 0 0
Accumulated other comprehensive income, ending balance 145 145
Participating policyholders    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance 14 9
Other comprehensive income (loss) (3) 5
Accumulated other comprehensive income, ending balance 11 14
Transfer to retained earnings (from accumulated other comprehensive income) 0 (89)
Shareholders    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance 1,690 1,105
Other comprehensive income (loss) (229) 585
Accumulated other comprehensive income, ending balance 1,461 1,690
Accumulated other comprehensive income (loss), net of taxes    
Disclosure of analysis of other comprehensive income by item [line items]    
Other comprehensive income (loss) $ (229) $ 585