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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 485 $ 336 $ 968 $ 674
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 5 4 9 9
Interest cost 31 44 62 87
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (1) (2) (3) (4)
Amortization of net actuarial losses 23 18 48 37
Net periodic pension and OPEB (income) expense 58 64 116 129
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 66 63 131 125
Interest cost 268 429 537 858
Expected return on plan assets (794) (817) (1,589) (1,633)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial losses 6 4 13 8
Net periodic pension and OPEB (income) expense (455) (322) (910) (644)
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 32 37 70 66
Interest cost 61 88 120 179
Expected return on plan assets (158) (163) (310) (333)
Amortization of prior service cost (credit) 2 1 3 3
Amortization of net actuarial losses 54 40 108 82
Net periodic pension and OPEB (income) expense $ (9) $ 3 $ (9) $ (3)