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Employee Benefit Plans (Benefit Obligation in Excess of Plan Assets) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Benefit obligation $ 724 $ 7,996
Fair value of plan assets 666 7,697
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Benefit obligation $ 171 195
Fair value of plan assets   $ 4