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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income       $ 172
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost $ 2 $ 2 $ 5 4
Interest cost 58 59 114 118
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (1) (1) (1) (1)
Amortization of net actuarial (gains) losses 0 (5) 0 (11)
Net periodic pension and OPEB (income) expense 59 55 118 110
U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 47 43 94 87
Interest cost 533 568 1,066 1,136
Expected return on plan assets (685) (730) (1,370) (1,460)
Amortization of prior service cost (credit) 15 0 30 (1)
Amortization of net actuarial (gains) losses 2 0 4 0
Net periodic pension and OPEB (income) expense (88) (119) (176) (238)
Non-U.S. | Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 36 42 70 84
Interest cost 133 176 261 337
Expected return on plan assets (137) (184) (268) (352)
Amortization of prior service cost (credit) 1 0 2 1
Amortization of net actuarial (gains) losses 11 9 23 17
Net periodic pension and OPEB (income) expense $ 44 $ 43 $ 88 $ 87