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Employee Benefit Plans (Components of Net Periodic Pension (Income) Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Non-service pension income $ (1,518) $ (1,780) $ (1,889)
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 189 222 470
Interest cost 2,385 2,507 1,520
Expected return on plan assets (3,747) (3,753) (3,544)
Amortization of prior service credit (170) (158) (163)
Recognized actuarial net (gain) loss 20 (378) 305
Net settlement, curtailment, and special termination benefits loss 13 6 2
Non-service pension income (1,499) (1,776) (1,880)
Net periodic pension and other postretirement income $ (1,310) $ (1,554) $ (1,410)