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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 376 $ 484 $ 1,100 $ 1,500
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 4 12 13
Interest cost 37 31 111 93
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (1) (2) (4) (5)
Amortization of net actuarial (gains) losses 17 25 51 73
Net periodic pension and OPEB (income) expense 57 58 170 174
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 58 65 174 196
Interest cost 323 269 969 806
Expected return on plan assets (750) (796) (2,250) (2,385)
Amortization of prior service cost (credit) (1) 0 (2) (2)
Amortization of net actuarial (gains) losses 5 7 14 20
Net periodic pension and OPEB (income) expense (365) (455) (1,095) (1,365)
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 35 35 103 105
Interest cost 71 60 221 180
Expected return on plan assets (130) (154) (404) (464)
Amortization of prior service cost (credit) 1 1 3 4
Amortization of net actuarial (gains) losses 32 53 101 161
Net periodic pension and OPEB (income) expense $ 9 $ (5) $ 24 $ (14)