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Pension and Postretirement Benefit Plans - Components of net periodic benefit cost and other information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net periodic benefit cost (benefit)      
Net periodic benefit cost (benefit) $ (68) $ (73) $ (128)
Funded | Postretirement Benefits      
Net periodic benefit cost (benefit)      
Service cost 43 52 52
Interest cost 82 79 80
Expected return on plan assets (81) (84) (86)
Amortization of prior service benefit (33) (40) (53)
Amortization of net actuarial loss 34 61 56
Settlements, curtailments, special terminations and other 5   (4)
Total non-operating expense (benefit) 7 16 (7)
Net periodic benefit cost (benefit) 50 68 45
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Prior service cost (benefit) (171)   (1)
Amortization of prior service benefit 33 40 53
Net actuarial (gain) loss 119 (127) 69
Amortization of net actuarial loss (34) (61) (56)
Foreign currency (1) (2)  
Settlements, curtailments, special termination benefits and other (5)    
Total recognized in other comprehensive income (loss) (59) (150) 65
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss (9) (82) 110
Funded | United States | Qualified and Non-qualified Pension Benefits      
Net periodic benefit cost (benefit)      
Service cost 251 288 268
Interest cost 620 563 565
Expected return on plan assets (1,040) (1,087) (1,035)
Amortization of prior service benefit (24) (23) (23)
Amortization of net actuarial loss 366 503 388
Settlements, curtailments, special terminations and other 70   2
Total non-operating expense (benefit) (8) (44) (103)
Net periodic benefit cost (benefit) 243 244 165
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Amortization of prior service benefit 24 23 23
Net actuarial (gain) loss 926 (44) 607
Amortization of net actuarial loss (366) (503) (388)
Settlements, curtailments, special termination benefits and other (35)   (2)
Total recognized in other comprehensive income (loss) 549 (524) 240
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss 792 (280) 405
Funded | International | Qualified and Non-qualified Pension Benefits      
Net periodic benefit cost (benefit)      
Service cost 131 143 142
Interest cost 156 157 157
Expected return on plan assets (299) (307) (292)
Amortization of prior service benefit (12) (13) (13)
Amortization of net actuarial loss 78 114 126
Settlements, curtailments, special terminations and other 10 4 4
Total non-operating expense (benefit) (67) (45) (18)
Net periodic benefit cost (benefit) 64 98 124
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Prior service cost (benefit) 3 7 6
Amortization of prior service benefit 12 13 13
Net actuarial (gain) loss 344 194 (244)
Amortization of net actuarial loss (78) (114) (126)
Foreign currency 7 (83) 167
Settlements, curtailments, special termination benefits and other (8) (4) (4)
Total recognized in other comprehensive income (loss) 280 13 (188)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss $ 344 $ 111 $ (64)