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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 86 $ 376 $ 258 $ 1,100
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 3 4 7 12
Interest cost 59 37 177 111
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) 0 (1) (1) (4)
Amortization of net actuarial (gains) losses (6) 17 (17) 51
Net periodic pension and OPEB (income) expense 56 57 166 170
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 44 58 131 174
Interest cost 568 323 1,704 969
Expected return on plan assets (730) (750) (2,190) (2,250)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial (gains) losses 0 5 0 14
Net periodic pension and OPEB (income) expense (119) (365) (357) (1,095)
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 39 35 123 103
Interest cost 184 71 521 221
Expected return on plan assets (192) (130) (544) (404)
Amortization of prior service cost (credit) 1 1 2 3
Amortization of net actuarial (gains) losses 8 32 25 101
Net periodic pension and OPEB (income) expense $ 40 $ 9 $ 127 $ 24