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Employee Benefit Plans (Company's Benefit Obligations and Funded Status) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in projected benefit obligation:      
Interest costs $ 6 $ 5 $ 7
Unfunded Supplemental Benefit Plans      
Change in projected benefit obligation:      
Benefit obligation at beginning of year 262 283  
Interest costs 6 5  
Actuarial gains (57) (11)  
Benefits paid (15) (15)  
Projected benefit obligation at end of year 196 262 $ 283
Change in plan assets:      
Contributions 15 14  
Benefits paid (15) (14)  
Fair value of plan assets at end of year 0 0  
Reconciliation of funded status, Unfunded status of the plans 196 262  
Amounts recognized in the consolidated balance sheet, Accrued benefit liability 196 262  
Unrecognized net actuarial loss 48 111  
Amounts recognized in accumulated other comprehensive income/loss 48 111  
Accumulated benefit obligation at end of year $ 196 $ 262