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Employee Benefits - Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit (income) cost $ 125 $ (28) $ (19)
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned 0 0 1
Interest cost on projected benefit obligation 3 3 1
Net amortization and deferrals (2) (6) (5)
Net periodic benefit (income) cost 1 (3) $ (3)
Net actuarial loss (gain) 4 3  
Recognized actuarial (loss) gain (1) 0  
Recognized prior service credit 2 5  
Total loss (gain) recognized in OCI (before tax effects) $ 5 $ 8