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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Postretirement Benefits Plan [Member] |  |  |  |  |  |
Change in benefit obligation |  |  |  |  |  |
Benefit obligation, beginning | [1],[2] | $ 2,028 |  | $ 2,254 |  |
Service cost | [3] | 39 | [1],[2] | 42 | [1],[2] | $ 41
Interest cost |  | 72 | [1],[2] | 90 | [1],[2] | 101
Employee contributions | [1],[2] | 102 |  | 94 |  |
Plan amendments | [1],[2] | 2 |  | 0 |  |
Changes in actuarial assumptions and other | [1],[2] | (122) |  | (177) |  |
Foreign exchange impact | [1],[2] | (4) |  | 5 |  |
Acquisitions/divestitures/other, net | [1],[2] | 0 |  | 1 |  |
Curtailments | [1],[2] | (1) |  | 1 |  |
Settlements | [1],[2] | 0 |  | 0 |  |
Special termination benefits |  | 2 | [1],[2] | 0 | [1],[2] | 0
Benefits paid | [1],[2] | (249) |  | (280) |  |
Benefit obligation, ending | [1],[2] | 1,870 |  | 2,028 |  | 2,254
Change in plan assets |  |  |  |  |  |
Fair value of plan assets, beginning | [2] | 494 | [4] | 458 |  |
Actual gain/(loss) on plan assets | [2] | (22) |  | 39 |  |
Company contributions | [2] | 145 |  | 183 |  |
Employee contributions | [2] | 102 |  | 94 |  |
Foreign exchange impact | [2] | 0 |  | 0 |  |
Acquisitions/divestitures, net | [2] | 0 |  | 0 |  |
Settlements | [2] | 0 |  | 0 |  |
Benefits paid | [2] | (249) |  | (280) |  |
Fair value of plan assets, ending | [2] | 469 | [4] | 494 | [4] | 458
Funded status—Plan assets less than benefit obligation | [2] | (1,401) |  | (1,534) |  |
United States [Member] | Pension Plan [Member] |  |  |  |  |  |
Change in benefit obligation |  |  |  |  |  |
Benefit obligation, beginning | [1],[5] | 16,702 |  | 15,547 |  |
Service cost | [1],[5] | 0 |  | 269 |  |
Interest cost | [1],[5] | 598 |  | 634 |  |
Employee contributions | [1],[5] | 0 |  | 0 |  |
Plan amendments | [1],[5] | (22) |  | 0 |  |
Changes in actuarial assumptions and other | [1],[5] | (1,219) |  | 1,614 |  |
Foreign exchange impact | [1],[5] | 0 |  | 0 |  |
Acquisitions/divestitures/other, net | [1],[5] | 0 |  | 0 |  |
Curtailments | [1],[5] | 11 |  | 11 |  |
Settlements | [1],[5] | (391) |  | (842) |  |
Special termination benefits | [1],[5] | 6 |  | 0 |  |
Benefits paid | [1],[5] | (546) |  | (530) |  |
Benefit obligation, ending | [1],[5] | 15,141 |  | 16,702 |  | 15,547
Change in plan assets |  |  |  |  |  |
Fair value of plan assets, beginning | [5] | 14,284 |  | 12,556 |  |
Actual gain/(loss) on plan assets | [5] | (796) |  | 2,005 |  |
Company contributions | [5] | 500 |  | 1,095 |  |
Employee contributions | [5] | 0 |  | 0 |  |
Foreign exchange impact | [5] | 0 |  | 0 |  |
Acquisitions/divestitures, net | [5] | 0 |  |  |  |
Settlements | [5] | (391) |  | (842) |  |
Benefits paid | [5] | (546) |  | (530) |  |
Fair value of plan assets, ending | [5] | 13,051 |  | 14,284 |  | 12,556
Funded status—Plan assets less than benefit obligation | [5] | (2,089) |  | (2,418) |  |
Defined benefit plan, accumulated benefit obligation |  | 15,100 |  | 16,700 |  |
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] |  |  |  |  |  |
Change in benefit obligation |  |  |  |  |  |
Benefit obligation, beginning | [1] | 1,495 |  | 1,450 |  |
Service cost | [1] | 0 |  | 24 |  |
Interest cost | [1] | 55 |  | 54 |  |
Employee contributions | [1] | 0 |  | 0 |  |
Plan amendments | [1] | 0 |  | 0 |  |
Changes in actuarial assumptions and other | [1] | (152) |  | 110 |  |
Foreign exchange impact | [1] | 0 |  | 0 |  |
Acquisitions/divestitures/other, net | [1] | 0 |  | 0 |  |
Curtailments | [1] | 1 |  | 0 |  |
Settlements | [1] | (72) |  | (98) |  |
Special termination benefits | [1] | 10 |  | 0 |  |
Benefits paid | [1] | (58) |  | (45) |  |
Benefit obligation, ending | [1] | 1,280 |  | 1,495 |  | 1,450
Change in plan assets |  |  |  |  |  |
Fair value of plan assets, beginning |  | 0 |  | 0 |  |
Company contributions |  | 129 |  | 143 |  |
Employee contributions |  | 0 |  | 0 |  |
Foreign exchange impact |  | 0 |  | 0 |  |
Settlements |  | (72) |  | (98) |  |
Benefits paid |  | (58) |  | (45) |  |
Fair value of plan assets, ending |  | 0 |  | 0 |  | 0
Funded status—Plan assets less than benefit obligation |  | (1,280) |  | (1,495) |  |
Defined benefit plan, accumulated benefit obligation |  | 1,300 |  | 1,500 |  |
Foreign Plan [Member] | Pension Plan [Member] |  |  |  |  |  |
Change in benefit obligation |  |  |  |  |  |
Benefit obligation, beginning | [1],[6] | 10,607 |  | 9,691 |  |
Service cost | [3] | 136 | [1],[6] | 171 | [1],[6] | 165
Interest cost |  | 212 | [1],[6] | 204 | [1],[6] | 233
Employee contributions | [1],[6] | 7 |  | 6 |  |
Plan amendments | [1],[6] | 29 |  | 2 |  |
Changes in actuarial assumptions and other | [1],[6] | (169) |  | 135 |  |
Foreign exchange impact | [1],[6] | (457) |  | 760 |  |
Acquisitions/divestitures/other, net | [1],[6] | (2) |  | 26 |  |
Curtailments | [1],[6] | (3) |  | 0 |  |
Settlements | [1],[6] | (34) |  | (31) |  |
Special termination benefits |  | 0 | [1],[6] | 1 | [1],[6] | 1
Benefits paid | [1],[6] | (373) |  | (357) |  |
Benefit obligation, ending | [1],[6] | 9,952 |  | 10,607 |  | 9,691
Change in plan assets |  |  |  |  |  |
Fair value of plan assets, beginning | [6] | 8,863 |  | 7,683 |  |
Actual gain/(loss) on plan assets | [6] | (77) |  | 811 |  |
Company contributions | [6] | 209 |  | 160 |  |
Employee contributions | [6] | 7 |  | 6 |  |
Foreign exchange impact | [6] | (380) |  | 561 |  |
Acquisitions/divestitures, net | [6] | 0 |  | 30 |  |
Settlements | [6] | (34) |  | (31) |  |
Benefits paid | [6] | (373) |  | (357) |  |
Fair value of plan assets, ending | [6] | 8,215 |  | 8,863 |  | $ 7,683
Funded status—Plan assets less than benefit obligation | [6] | (1,738) |  | (1,745) |  |
Defined benefit plan, accumulated benefit obligation |  | $ 9,500 |  | $ 10,100 |  |
[1] | For the U.S. and international pension plans, the benefit obligation is the PBO. For the postretirement plans, the benefit obligation is the ABO. The ABO for all of our U.S. qualified pension plans was $15.1 billion in 2018 and $16.7 billion in 2017. The ABO for our U.S. supplemental (non-qualified) pension plans was $1.3 billion in 2018 and $1.5 billion in 2017. The ABO for our international pension plans was $9.5 billion in 2018 and $10.1 billion in 2017.
[2] | The favorable change in the funded status of our postretirement plans was primarily due to an increase in the discount rate at the end of 2018, partially offset by a decrease in actual return on plan assets.
[3] | Effective January 1, 2018, we froze two significant defined benefit pension plans to future benefit accruals in the U.S. and U.K. and as a result, service costs for those plans are eliminated. In addition, due to the plan freeze, the average amortization period for the U.S. qualified plans and U.S. supplemental (non-qualified) plans was extended to the expected life expectancy of the plan participants, whereas the average amortization period in prior years utilized the expected future service period of plan participants.
[4] | Reflects postretirement plan assets, which support a portion of our U.S. retiree medical plans.
[5] | The favorable change in the funded status of our U.S. qualified plans was primarily due to an increase in the discount rate at the end of 2018, partially offset by a decrease in actual return on plan assets.
[6] | The favorable change in the international plans’ funded status was primarily due to favorable currency movements, partially offset by a decrease in the actual return on plan assets.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(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 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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