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Income Taxes - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 26.50% 27.00% 27.00%
Income tax provision at statutory rate $ 1,313 $ 951 $ 776
UK PRT and other taxes (76) (3) (67)
Impact of deductible UK PRT and other taxes on corporate income tax 32 3 28
Foreign and domestic tax rate differentials (48) 6 (43)
Non-taxable portion of capital (gains) losses (65) 142 (86)
Stock options exercised for common shares 47 (41) 33
Income tax rate and other legislative changes (1,618) 0 10
Non-taxable gain on corporate acquisitions 0 (119) (63)
Revisions arising from prior year tax filings (41) (136) (3)
Change in unrecognized capital loss carryforward asset (65) 142 (86)
Other 61 (14) (23)
Income tax (recovery) expense $ (460) $ 931 $ 476