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Pension And Other Retirement Benefits - Summary Of Pre Tax Amounts Recognized In Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) arising during the period $ 25 $ (8) $ (1)
U.S. Plans | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Amortization of net actuarial (gains) losses and prior service credit (1) (1) 3
(Gain) loss on settlement of pension obligations (1) (2) 0
Net actuarial gain (loss) arising during the period 22 (3) (19)
Total recognized in OCI – pre-tax 20 (6) (16)
U.S. Plans | Other Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Amortization of net actuarial (gains) losses and prior service credit (1) (1) 0
(Gain) loss on settlement of pension obligations 0 0 0
Net actuarial gain (loss) arising during the period 4 1 13
Total recognized in OCI – pre-tax $ 3 $ 0 $ 13