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Income Taxes - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 24.10% 26.50% 27.00%
Income tax provision at statutory rate $ (211) $ 1,313 $ 951
UK PRT and other taxes (25) (76) (3)
Impact of deductible UK PRT and other taxes on corporate income tax 11 32 3
Foreign and domestic tax rate differentials (52) (48) 6
Non-taxable portion of capital (gains) losses (10) (65) 142
Stock options exercised for common shares (25) 47 (41)
Income tax rate and other legislative changes 0 (1,618) 0
Non-taxable gain on corporate acquisitions (52) 0 (119)
Revisions arising from prior year tax filings (62) (41) (136)
Change in unrecognized capital loss carryforward asset (10) (65) 142
Other (2) 61 (14)
Income tax $ (438) $ (460) $ 931