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Income Taxes - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 23.20% 23.30% 23.20%
Income tax provision at statutory rate $ 1,870 $ 2,364 $ 3,180
UK PRT and other taxes (237) (255) (467)
Impact of UK PRT and other taxes on corporate income tax 95 105 190
Foreign and domestic tax rate differentials (112) (104) (203)
Non-taxable portion of capital loss (gains) 114 (35) 65
Stock options exercised for common shares 41 91 159
Revisions arising from prior year tax filings 43 (174) (186)
Change in unrecognized capital loss carryforward asset 114 (35) 65
Other 25 (25) (36)
Income tax $ 1,953 $ 1,932 $ 2,767