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Employee Benefit Plans (Components of Net Periodic Benefit Cost Included in General and Administrative Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 204 $ 276 $ 328
Interest cost 551 431 364
Expected return on plan assets (926) (866) (824)
Amortization of prior service cost (1) (1) (3)
Amortization of actuarial (gain) loss, net 69 160 245
Settlements 3 2 5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 1
Special termination benefits 25 4 1
Net periodic (benefit) cost (75) 6 117
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 9 13 27
Interest cost 71 56 49
Expected return on plan assets (86) (102) (102)
Amortization of prior service cost (7) (8) 6
Amortization of actuarial (gain) loss, net 10 6 16
Settlements 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 (7) 0
Special termination benefits 5 4 0
Net periodic (benefit) cost $ 2 $ (38) $ (4)