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Income Tax - Summary of Deductible Temporary Differences af Income Tax Expenses (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 955 $ 915
Canadian Tax Losses [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 229 254
Canadian Restricted Interest [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 39 0
Canadian Long-term assets [Member] | Assets [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised (2) 1
Canadian Accounting provisions and other accruals [Member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 35 15
Foreign tax Losses [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 646 688
Foreign Restricted Interest [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 13 0
Foreign Long-term assets [Member] | Assets [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised (5) (41)
Foreign Accounting provisions and other accruals [Member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 0 $ (2)