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Income Taxes - Movement in Net Deferred Tax Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets $ 887 $ 892
Acquisitions (disposals) (48)  
Charged to statement of operations 254 (37)
Charged to other comprehensive income (51) 24
Charged to equity, other than other comprehensive income 9 9
Foreign exchange rate movements and Other (2) (1)
Ending balance, deferred tax assets 1,049 887
Investments    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (746) (957)
Acquisitions (disposals) 0  
Charged to statement of operations (263) 195
Charged to other comprehensive income (52) 45
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other 21 (29)
Ending balance, deferred tax assets (1,040) (746)
Policy liabilities    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 737 896
Acquisitions (disposals) 0  
Charged to statement of operations 406 (170)
Charged to other comprehensive income (9) 0
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (13) 11
Ending balance, deferred tax assets 1,121 737
Deferred acquisition costs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 96 77
Acquisitions (disposals) 0  
Charged to statement of operations (9) 6
Charged to other comprehensive income 0 0
Charged to equity, other than other comprehensive income 0 6
Foreign exchange rate movements and Other (4) 7
Ending balance, deferred tax assets 83 96
Losses available for carry forward    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 648 549
Acquisitions (disposals) 0  
Charged to statement of operations 63 107
Charged to other comprehensive income (10) (13)
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (4) 5
Ending balance, deferred tax assets 697 648
Pension and other employee benefits    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 319 351
Acquisitions (disposals) 0  
Charged to statement of operations 7 (26)
Charged to other comprehensive income 21 (17)
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (9) 11
Ending balance, deferred tax assets 338 319
Other    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (167) (24)
Acquisitions (disposals) (48)  
Charged to statement of operations 50 (149)
Charged to other comprehensive income (1) 9
Charged to equity, other than other comprehensive income 9 3
Foreign exchange rate movements and Other 7 (6)
Ending balance, deferred tax assets $ (150) $ (167)