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Employee Benefit Plans (Status of Prepaid Benefits Costs and Accrued Benefit Liabilities Included in Other Assets and Other Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Change in benefit obligation      
Benefit obligation at the beginning of period $ (11,099) $ (14,787)  
Service cost (204) (276) $ (328)
Interest cost (551) (431) (364)
Plan participants’ contributions 0 0  
Medicare Part D subsidy receipts 0 0  
Amendments 2 (1)  
Curtailments 0 47  
Actuarial gains (losses), net (274) 3,242  
Settlements 22 35  
Special termination benefits (25) (4)  
Benefits paid 827 855  
Foreign currency changes and other 64 221  
Benefit obligation at end of period (11,238) (11,099) (14,787)
Change in plan assets      
Plan assets at beginning of period 12,519 15,242  
Actual return on plan assets 788 (1,945)  
Employer contributions 185 176  
Plan participants’ contributions 0 0  
Disbursement for settlements (22) (35)  
Benefits paid (827) (855)  
Foreign currency changes and other 6 (64)  
Plan assets at end of period 12,649 12,519 15,242
Funded status at end of period 1,411 1,420  
Amounts recognized in the Statements of Financial Position      
Prepaid benefit cost 3,385 3,622  
Accrued benefit liability (1,974) (2,202)  
Net amount recognized 1,411 1,420  
Items recorded in “Accumulated other comprehensive income (loss)” not yet recognized as a component of net periodic (benefit) cost:      
Prior service cost (2) (2)  
Net actuarial loss 2,797 2,466  
Net amount not recognized 2,795 2,464  
Accumulated benefit obligation (10,512) (10,661)  
Other Postretirement Benefits      
Change in benefit obligation      
Benefit obligation at the beginning of period (1,348) (1,793)  
Service cost (9) (13) (27)
Interest cost (71) (56) (49)
Plan participants’ contributions (24) (27)  
Medicare Part D subsidy receipts 0 (6)  
Amendments 298 0  
Curtailments 0 1  
Actuarial gains (losses), net (66) 364  
Settlements 0 0  
Special termination benefits (5) (4)  
Benefits paid 193 185  
Foreign currency changes and other 0 1  
Benefit obligation at end of period (1,032) (1,348) (1,793)
Change in plan assets      
Plan assets at beginning of period 1,191 1,621  
Actual return on plan assets 155 (282)  
Employer contributions 9 10  
Plan participants’ contributions 24 27  
Disbursement for settlements 0 0  
Benefits paid (193) (185)  
Foreign currency changes and other 0 0  
Plan assets at end of period 1,186 1,191 $ 1,621
Funded status at end of period 154 (157)  
Amounts recognized in the Statements of Financial Position      
Prepaid benefit cost 240 0  
Accrued benefit liability (86) (157)  
Net amount recognized 154 (157)  
Items recorded in “Accumulated other comprehensive income (loss)” not yet recognized as a component of net periodic (benefit) cost:      
Prior service cost (345) (54)  
Net actuarial loss 209 222  
Net amount not recognized (136) 168  
Accumulated benefit obligation $ (1,032) $ (1,348)