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Income Taxes - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 23.20% 23.20% 24.10%
Income tax provision at statutory rate $ 3,180 $ 2,298 $ (211)
UK PRT and other taxes (467) (21) (25)
Impact of UK PRT and other taxes on corporate income tax 190 11 11
Foreign and domestic tax rate differentials (203) (11) (52)
Non-taxable portion of capital gains 65 (26) (10)
Stock options exercised for common shares 159 98 (25)
Non-taxable gain on corporate acquisitions 0 (110) (52)
Revisions arising from prior year tax filings (186) 16 (62)
Change in unrecognized capital loss carryforward asset 65 (26) (10)
Other (36) 18 (2)
Income tax $ 2,767 $ 2,247 $ (438)