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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 336 $ 232 $ 674 $ 462
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 4 9 8
Interest cost 44 55 87 109
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (2) (4) (4) (7)
Amortization of net actuarial losses 18 7 37 15
Net periodic pension and OPEB (income) expense 64 62 129 125
U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 63 98 125 196
Interest cost 429 566 858 1,132
Expected return on plan assets (817) (871) (1,633) (1,739)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial losses 4 3 8 6
Net periodic pension and OPEB (income) expense (322) (205) (644) (407)
Non-U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 37 29 66 64
Interest cost 88 118 179 238
Expected return on plan assets (163) (192) (333) (387)
Amortization of prior service cost (credit) 1 1 3 2
Amortization of net actuarial losses 40 30 82 59
Net periodic pension and OPEB (income) expense $ 3 $ (14) $ (3) $ (24)