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Employee Benefit Plans (Components of Provision for Net Periodic Benefit (Credit) Cost) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 19 $ 19 $ 57 $ 63
Interest cost 108 107 325 324
Expected return on plan assets (170) (200) (508) (611)
Amortization of prior service cost (credit) 1 1 1 1
Amortization of net actuarial (gain) loss 0 (23) 0 (171)
Curtailments 0 0 0 (56)
Plan amendment 0 0 0 22
Net periodic benefit (credit) cost (42) (96) (125) (428)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 2 8 8
Interest cost 13 15 42 43
Expected return on plan assets (39) (43) (119) (128)
Amortization of prior service cost (credit) (6) (9) (19) (27)
Amortization of net actuarial (gain) loss 0 11 0 (58)
Curtailments 0 0 0 (4)
Plan amendment 0 0 0 0
Net periodic benefit (credit) cost $ (29) $ (24) $ (88) $ (166)