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Income Taxes - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Current tax assets $ 1,070 $ 1,056
Current tax liabilities $ 453 $ 147
Average effective tax rate 27.80% 27.80%
Deferred tax assets $ 5,884 $ 6,739
Deferred tax assets, recognition dependent on future taxable profits 27 6,136
Operating tax loss carry forward 4,837 3,549
Operating tax loss carry forward expired in future 4,068  
Operating tax loss carry forward without expiration date 769  
Capital tax loss carry forward 27 5
Tax benefit on loss carry forwards for which deferred tax asset recognized 851 670
Tax benefit of loss carry forwards for which no deferred tax asset recognized 356 222
Tax credit carry forwards which expire in future 412 282
Tax credit carryforwards of which benefit not recognized 174 160
Deferred tax liabilities 1,890 1,697
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements 14,955 10,908
Tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax asset for deductible temporary differences 1,152 1,171
Temporary differences [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 5,341 $ 5,333