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Accumulated Other Comprehensive Income (Loss) and Non-Controlling Interests - Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance $ 1,114 $ 1,669
Other comprehensive income (loss) 590 (568)
Other   13
Accumulated other comprehensive income, ending balance 1,704 1,114
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 1,012 1,749
Other comprehensive income (loss) 911 (737)
Accumulated other comprehensive income, ending balance 1,923 1,012
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 346 211
Other comprehensive income (loss) (402) 135
Accumulated other comprehensive income, ending balance (56) 346
Unrealized gains (losses) on cash flow hedges    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance (11) (6)
Other comprehensive income (loss) (10) (5)
Accumulated other comprehensive income, ending balance (21) (11)
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 (31) 0
Other comprehensive income (loss) 7 (31)
Accumulated other comprehensive income, ending balance (24) (31)
Remeasurement of defined benefit plans    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance (347) (291)
Other comprehensive income (loss) 84 (69)
Other   13
Accumulated other comprehensive income, ending balance (263) (347)
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 6
Other comprehensive income (loss) 0 139
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 9 16
Other comprehensive income (loss) 5 (7)
Other   0
Accumulated other comprehensive income, ending balance 14 9
Transfer to retained earnings (from accumulated other comprehensive income) (89)  
Shareholders    
Disclosure of analysis of other comprehensive income by item [line items]    
Accumulated other comprehensive income, beginning balance 1,105 1,653
Other comprehensive income (loss)   (561)
Other   13
Accumulated other comprehensive income, ending balance   1,105
Retained earnings    
Disclosure of analysis of other comprehensive income by item [line items]    
Transfer to retained earnings (from accumulated other comprehensive income)   (13)
Accumulated other comprehensive income (loss), net of taxes    
Disclosure of analysis of other comprehensive income by item [line items]    
Other comprehensive income (loss) $ 585 (561)
Transfer to retained earnings (from accumulated other comprehensive income)   $ 13