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Income Taxes - Movement in Net Deferred Tax Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets $ 1,049 $ 887
Acquisitions (disposals) through business combinations (67) (48)
Charged to statement of operations 371 254
Charged to other comprehensive income (112) (51)
Charged to equity, other than other comprehensive income (1) 9
Foreign exchange rate movements and Other 11 (2)
Ending balance, deferred tax assets 1,251 1,049
Investments    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (1,040) (746)
Acquisitions (disposals) through business combinations 0 0
Charged to statement of operations (149) (263)
Charged to other comprehensive income (54) (52)
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other 3 21
Ending balance, deferred tax assets (1,240) (1,040)
Policy liabilities    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 1,121 737
Acquisitions (disposals) through business combinations 0 0
Charged to statement of operations 494 406
Charged to other comprehensive income 0 (9)
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other 6 (13)
Ending balance, deferred tax assets 1,621 1,121
Deferred acquisition costs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 83 96
Acquisitions (disposals) through business combinations 0 0
Charged to statement of operations 0 (9)
Charged to other comprehensive income 0 0
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (1) (4)
Ending balance, deferred tax assets 82 83
Losses available for carry forward    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 697 648
Acquisitions (disposals) through business combinations 0 0
Charged to statement of operations 62 63
Charged to other comprehensive income (50) (10)
Charged to equity, other than other comprehensive income (1) 0
Foreign exchange rate movements and Other 0 (4)
Ending balance, deferred tax assets 708 697
Pension and other employee benefits    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 338 319
Acquisitions (disposals) through business combinations 0 0
Charged to statement of operations (5) 7
Charged to other comprehensive income (8) 21
Charged to equity, other than other comprehensive income 0 0
Foreign exchange rate movements and Other (3) (9)
Ending balance, deferred tax assets 322 338
Other    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (150) (167)
Acquisitions (disposals) through business combinations (67) (48)
Charged to statement of operations (31) 50
Charged to other comprehensive income 0 (1)
Charged to equity, other than other comprehensive income 0 9
Foreign exchange rate movements and Other 6 7
Ending balance, deferred tax assets $ (242) $ (150)