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Pension and Postretirement Benefit Plans - Components of net periodic benefit cost and other information (Details) - Funded - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Qualified and Non-qualified Pension Benefits | United States |  |  |
Net periodic benefit cost (benefit) |  |  |
Service cost | $ 268 | $ 259 | $ 293
Interest cost | 565 | 575 | 655
Expected return on plan assets | (1,035) | (1,043) | (1,069)
Amortization of prior service benefit | (23) | (24) | (24)
Amortization of net actuarial loss | 388 | 354 | 409
Settlements, curtailments, special terminations and other | 2 | 4 | 2
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other | 165 | 125 | 266
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Prior service cost (benefit) |  | 5 |
Amortization of prior service benefit | 23 | 24 | 24
Net actuarial (gain) loss | 605 | 692 | 312
Amortization of net actuarial loss | (388) | (354) | (409)
Total recognized in other comprehensive income (loss) | 240 | 367 | (73)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | 405 | 492 | 193
Qualified and Non-qualified Pension Benefits | International Qualified and Non-qualified Pension Benefits |  |  |
Net periodic benefit cost (benefit) |  |  |
Service cost | 142 | 133 | 154
Interest cost | 157 | 171 | 206
Expected return on plan assets | (292) | (309) | (308)
Amortization of transition asset |  | (1) | (1)
Amortization of prior service benefit | (13) | (13) | (13)
Amortization of net actuarial loss | 126 | 91 | 144
Settlements, curtailments, special terminations and other | 4 | 4 | (6)
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other | 124 | 76 | 176
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset |  | 1 | 1
Prior service cost (benefit) | 6 | (5) | 10
Amortization of prior service benefit | 13 | 13 | 13
Net actuarial (gain) loss | (248) | 512 | (270)
Amortization of net actuarial loss | (126) | (91) | (144)
Foreign currency | 167 | (93) | (174)
Total recognized in other comprehensive income (loss) | (188) | 337 | (564)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (64) | 413 | (388)
Postretirement Benefits |  |  |
Net periodic benefit cost (benefit) |  |  |
Service cost | 52 | 54 | 75
Interest cost | 80 | 79 | 98
Expected return on plan assets | (86) | (90) | (91)
Amortization of prior service benefit | (53) | (55) | (42)
Amortization of net actuarial loss | 56 | 61 | 73
Settlements, curtailments, special terminations and other | (4) |  | 1
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other | 45 | 49 | 114
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Prior service cost (benefit) | (1) |  | (212)
Amortization of prior service benefit | 53 | 55 | 42
Net actuarial (gain) loss | 69 | 8 | (23)
Amortization of net actuarial loss | (56) | (61) | (73)
Foreign currency |  |  | (1)
Total recognized in other comprehensive income (loss) | 65 | 2 | (267)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | $ 110 | $ 51 | $ (153)

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