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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 376 $ 485 $ 752 $ 968
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 5 8 9
Interest cost 37 31 74 62
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (2) (1) (3) (3)
Amortization of net actuarial losses 17 23 34 48
Net periodic pension and OPEB (income) expense 56 58 113 116
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 58 66 116 131
Interest cost 323 268 646 537
Expected return on plan assets (750) (794) (1,500) (1,589)
Amortization of prior service cost (credit) 0 (1) (1) (2)
Amortization of net actuarial losses 4 6 9 13
Net periodic pension and OPEB (income) expense (365) (455) (730) (910)
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 33 32 68 70
Interest cost 74 61 150 120
Expected return on plan assets (135) (158) (274) (310)
Amortization of prior service cost (credit) 1 2 2 3
Amortization of net actuarial losses 34 54 69 108
Net periodic pension and OPEB (income) expense $ 7 $ (9) $ 15 $ (9)