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Employee Benefit Plans (Change in Fair Value of Plan Assets) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Retirement Benefits [Abstract]    
Beginning balance $ 561 $ 768
Actual return (loss) on plan assets 66 (161)
Benefits paid (39) (46)
Ending balance $ 588 $ 561