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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Non-service cost components of net periodic pension and OPEB income $ 376 $ 483
Global OPEB Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 4 4
Interest cost 37 31
Expected return on plan assets 0 0
Amortization of prior service cost (credit) (1) (2)
Amortization of net actuarial losses 17 25
Net periodic pension and OPEB (income) expense 57 58
U.S. | Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 58 65
Interest cost 323 269
Expected return on plan assets (750) (795)
Amortization of prior service cost (credit) (1) (1)
Amortization of net actuarial losses 5 7
Net periodic pension and OPEB (income) expense (365) (455)
Non-U.S. | Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Service cost 35 38
Interest cost 76 59
Expected return on plan assets (139) (152)
Amortization of prior service cost (credit) 1 1
Amortization of net actuarial losses 35 54
Net periodic pension and OPEB (income) expense $ 8 $ 0