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Employee Benefit Plans (Principal Components of Employee Benefit Costs) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefits Cost (Reversal of Cost) $ 109 $ 60 $ 93
Savings Plan      
Employee Benefit Plan Disclosure [Line Items]      
Savings plan 74 32 60
Unfunded Supplemental Benefit Plans      
Employee Benefit Plan Disclosure [Line Items]      
Employee benefit plan expenses 11 9 9
Other Plans, Net      
Employee Benefit Plan Disclosure [Line Items]      
Other plans, net $ 24 $ 19 $ 24