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Income Taxes - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 23.20% 24.10% 26.50%
Income tax provision at statutory rate $ 2,298 $ (211) $ 1,313
UK PRT and other taxes (21) (25) (76)
Impact of deductible UK PRT and other taxes on corporate income tax 11 11 32
Foreign and domestic tax rate differentials (11) (52) (48)
Non-taxable portion of capital gains (26) (10) (65)
Stock options exercised for common shares 98 (25) 47
Income tax rate and other legislative changes 0 0 (1,618)
Non-taxable gain on corporate acquisitions (110) (52) 0
Revisions arising from prior year tax filings 16 (62) (41)
Change in unrecognized capital loss carryforward asset (26) (10) (65)
Other 18 (2) 61
Income tax $ 2,247 $ (438) $ (460)