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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net periodic benefit cost (benefit) |  |  |
Net periodic benefit cost (benefit) | $ (73) | $ (128) | $ (196)
Funded | Postretirement Benefits |  |  |
Net periodic benefit cost (benefit) |  |  |
Service cost | 52 | 52 | 54
Interest cost | 79 | 80 | 79
Expected return on plan assets | (84) | (86) | (90)
Amortization of prior service benefit | (40) | (53) | (55)
Amortization of net actuarial loss | 61 | 56 | 61
Settlements, curtailments, special terminations and other |  | (4) |
Total non-operating expense (benefit) | 16 | (7) | (5)
Net periodic benefit cost (benefit) | 68 | 45 | 49
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Prior service cost (benefit) |  | (1) |
Amortization of prior service benefit | 40 | 53 | 55
Net actuarial (gain) loss | (127) | 69 | 8
Amortization of net actuarial loss | (61) | (56) | (61)
Foreign currency | (2) |  |
Total recognized in other comprehensive income (loss) | (150) | 65 | 2
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (82) | 110 | 51
Funded | United States | Qualified and Non-qualified Pension Benefits |  |  |
Net periodic benefit cost (benefit) |  |  |
Service cost | 288 | 268 | 259
Interest cost | 563 | 565 | 575
Expected return on plan assets | (1,087) | (1,035) | (1,043)
Amortization of prior service benefit | (23) | (23) | (24)
Amortization of net actuarial loss | 503 | 388 | 354
Settlements, curtailments, special terminations and other |  | 2 | 4
Total non-operating expense (benefit) | (44) | (103) | (134)
Net periodic benefit cost (benefit) | 244 | 165 | 125
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 | 23 | 24
Net actuarial (gain) loss | (44) | 605 | 692
Amortization of net actuarial loss | (503) | (388) | (354)
Total recognized in other comprehensive income (loss) | (524) | 240 | 367
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | (280) | 405 | 492
Funded | International | Qualified and Non-qualified Pension Benefits |  |  |
Net periodic benefit cost (benefit) |  |  |
Service cost | 143 | 142 | 133
Interest cost | 157 | 157 | 171
Expected return on plan assets | (307) | (292) | (309)
Amortization of transition asset |  |  | (1)
Amortization of prior service benefit | (13) | (13) | (13)
Amortization of net actuarial loss | 114 | 126 | 91
Settlements, curtailments, special terminations and other | 4 | 4 | 4
Total non-operating expense (benefit) | (45) | (18) | (57)
Net periodic benefit cost (benefit) | 98 | 124 | 76
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss |  |  |
Amortization of transition asset |  |  | 1
Prior service cost (benefit) | 7 | 6 | (5)
Amortization of prior service benefit | 13 | 13 | 13
Net actuarial (gain) loss | 190 | (248) | 512
Amortization of net actuarial loss | (114) | (126) | (91)
Foreign currency | (83) | 167 | (93)
Total recognized in other comprehensive income (loss) | 13 | (188) | 337
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss | $ 111 | $ (64) | $ 413

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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