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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 484 $ 322 $ 1,500 $ 996
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 5 13 14
Interest cost 31 43 93 130
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (2) (1) (5) (5)
Amortization of net actuarial losses 25 18 73 55
Curtailments, settlements and other 0 0 0 0
Net periodic pension and OPEB (income) expense 58 65 174 194
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 65 63 196 188
Interest cost 269 429 806 1,287
Expected return on plan assets (796) (816) (2,385) (2,449)
Amortization of prior service cost (credit) 0 (1) (2) (3)
Amortization of net actuarial losses 7 4 20 12
Curtailments, settlements and other 0 0 0 0
Net periodic pension and OPEB (income) expense (455) (321) (1,365) (965)
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 35 41 105 107
Interest cost 60 92 180 271
Expected return on plan assets (154) (174) (464) (507)
Amortization of prior service cost (credit) 1 2 4 5
Amortization of net actuarial losses 53 44 161 126
Curtailments, settlements and other 0 15 0 15
Net periodic pension and OPEB (income) expense $ (5) $ 20 $ (14) $ 17