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Employee Benefits - Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI (Detail) - Postretirement Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned $ 1 $ 1 $ 1
Interest cost on projected benefit obligation 1 7 2
Net amortization and deferrals (5) (20) (5)
Net periodic benefit cost (income) (3) (12) $ (2)
Net actuarial (gain) loss (16) (3)  
Recognized actuarial loss (1) (2)  
Recognized prior service credit 6 6  
Total (gain) loss recognized in OCI (before tax effects) $ (11) $ 1