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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
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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)

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