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Income Tax - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Federal Income Tax Rate 15.00% 15.00%
Deductible temporary differences for which no deferred tax asset is recognised $ 955,000,000 $ 915,000,000
Unused tax credits for which no deferred tax asset recognised $ 1,000,000 $ 1,000,000
Average effective tax rate 8.40% 8.50%
Income tax in other comprehensive income (loss) $ 0 $ 0
USA    
Disclosure of defined benefit plans [line items]    
Unused tax credits for which no deferred tax asset recognised $ 62,000,000 $ 59,000,000