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Employee Benefit Plans (Company's Benefit Obligations and Funded Status) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in projected benefit obligation:      
Interest costs $ 5 $ 7 $ 9
Unfunded Supplemental Benefit Plans      
Change in projected benefit obligation:      
Benefit obligation at beginning of year 283 259  
Interest costs 5 7  
Actuarial (gains) losses (11) 31  
Benefits paid (15) (14)  
Projected benefit obligation at end of year 262 283 $ 259
Change in plan assets:      
Contributions 14 14  
Benefits paid (14) (14)  
Fair value of plan assets at end of year 0 0  
Reconciliation of funded status, Unfunded status of the plans 262 283  
Amounts recognized in the consolidated balance sheet, Accrued benefit liability 262 283  
Unrecognized net actuarial loss 111 129  
Unrecognized prior service credit 0 (1)  
Amounts recognized in accumulated other comprehensive income/loss 111 128  
Accumulated benefit obligation at end of year $ 262 $ 283