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Income Taxes - Movement in Net Deferred Tax Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets $ 892 $ 761
Acquisitions (disposals) through business combinations   (10)
Charged to statement of operations (37) 214
Charged to other comprehensive income 24 (64)
Charged to equity, other than other comprehensive income 9  
Foreign exchange rate movements (1) (9)
Ending balance, deferred tax assets 887 892
Investments    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (957) (1,064)
Acquisitions (disposals) through business combinations   0
Charged to statement of operations 195 132
Charged to other comprehensive income 45 (73)
Charged to equity, other than other comprehensive income 0  
Foreign exchange rate movements (29) 48
Ending balance, deferred tax assets (746) (957)
Policy liabilities    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 896 517
Acquisitions (disposals) through business combinations   0
Charged to statement of operations (170) 388
Charged to other comprehensive income 0 0
Charged to equity, other than other comprehensive income 0  
Foreign exchange rate movements 11 (9)
Ending balance, deferred tax assets 737 896
Deferred acquisition costs    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 77 171
Acquisitions (disposals) through business combinations   0
Charged to statement of operations 6 (74)
Charged to other comprehensive income 0 0
Charged to equity, other than other comprehensive income 6  
Foreign exchange rate movements 7 (20)
Ending balance, deferred tax assets 96 77
Losses available for carry forward    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 549 513
Acquisitions (disposals) through business combinations   0
Charged to statement of operations 107 43
Charged to other comprehensive income (13) (9)
Charged to equity, other than other comprehensive income 0  
Foreign exchange rate movements 5 2
Ending balance, deferred tax assets 648 549
Pension and other employee benefits    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets 351 410
Acquisitions (disposals) through business combinations   0
Charged to statement of operations (26) (66)
Charged to other comprehensive income (17) 22
Charged to equity, other than other comprehensive income 0  
Foreign exchange rate movements 11 (15)
Ending balance, deferred tax assets 319 351
Other    
Reconciliation of changes in deferred tax assets [abstract]    
Beginning balance, deferred tax assets (24) 214
Acquisitions (disposals) through business combinations   (10)
Charged to statement of operations (149) (209)
Charged to other comprehensive income 9 (4)
Charged to equity, other than other comprehensive income 3  
Foreign exchange rate movements (6) (15)
Ending balance, deferred tax assets $ (167) $ (24)