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Income Taxes - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 23.30% 23.20% 23.20%
Income tax provision at statutory rate $ 2,364 $ 3,180 $ 2,298
UK PRT and other taxes (255) (467) (21)
Impact of UK PRT and other taxes on corporate income tax 105 190 11
Foreign and domestic tax rate differentials (104) (203) (11)
Non-taxable portion of capital gains (35) 65 (26)
Stock options exercised for common shares 91 159 98
Non-taxable gain on corporate acquisitions 0 0 (110)
Revisions arising from prior year tax filings (174) (186) 16
Change in unrecognized capital loss carryforward asset (35) 65 (26)
Other (25) (36) 18
Income tax $ 1,932 $ 2,767 $ 2,247