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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Postretirement Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | $ 1,019 | $ 1,913 |
Actual return on plan assets | 161 | 138 |
Company contributions, net | (4) | 68 |
Effects of exchange rate changes | 0 | 0 |
Benefits paid | (62) | (108) |
Settlements | 0 | 0 |
Assets no longer restricted to the payment of postretirement benefits | 0 | (992) |
Other | 0 | 0 |
Fair value of plan assets December 31 | 1,114 | 1,019 | $ 1,913
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 1,922 | 1,810 |
Service cost | 57 | 54 | 80
Interest cost | 81 | 82 | 110
Actuarial losses (gains) | (87) | 77 |
Benefits paid | (62) | (108) |
Effects of exchange rate changes | 3 | 2 |
Plan amendments | 0 | 0 |
Curtailments | 0 | 1 |
Termination benefits | 8 | 4 | 7
Settlements | 0 | 0 |
Other | 0 | 0 |
Benefit obligation December 31 | 1,922 | 1,922 | 1,810
Funded status December 31 | (808) | (903) |
Recognized as: |  |  |
Other assets | 0 | 0 |
Accrued and other current liabilities | (11) | (11) |
Other noncurrent liabilities | (797) | (892) |
United States | Pension Plan |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | 9,766 | 9,266 |
Actual return on plan assets | 1,723 | 941 |
Company contributions, net | 58 | 63 |
Effects of exchange rate changes | 0 | 0 |
Benefits paid | (651) | (504) |
Settlements | 0 | 0 |
Assets no longer restricted to the payment of postretirement benefits | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets December 31 | 10,896 | 9,766 | 9,266
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 10,849 | 9,723 |
Service cost | 312 | 282 | 307
Interest cost | 454 | 456 | 434
Actuarial losses (gains) | 881 | 854 |
Benefits paid | (651) | (504) |
Effects of exchange rate changes | 0 | 0 |
Plan amendments | 0 | 0 |
Curtailments | 15 | 15 |
Termination benefits | 44 | 23 | 22
Settlements | 0 | 0 |
Other | 0 | 0 |
Benefit obligation December 31 | 11,904 | 10,849 | 9,723
Funded status December 31 | (1,008) | (1,083) |
Recognized as: |  |  |
Other assets | 0 | 0 |
Accrued and other current liabilities | (59) | (50) |
Other noncurrent liabilities | (949) | (1,033) |
International | Pension Plan |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | 7,794 | 7,204 |
Actual return on plan assets | 677 | 898 |
Company contributions, net | 226 | 424 |
Effects of exchange rate changes | 843 | (546) |
Benefits paid | (198) | (193) |
Settlements | (17) | (21) |
Assets no longer restricted to the payment of postretirement benefits | 0 | 0 |
Other | 14 | 28 |
Fair value of plan assets December 31 | 9,339 | 7,794 | 7,204
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 8,372 | 7,733 |
Service cost | 252 | 238 | 251
Interest cost | 172 | 204 | 206
Actuarial losses (gains) | (7) | 938 |
Benefits paid | (198) | (193) |
Effects of exchange rate changes | 916 | (576) |
Plan amendments | (22) | 0 |
Curtailments | (3) | (15) |
Termination benefits | 4 | 4 | 1
Settlements | (17) | (21) |
Other | 14 | 60 |
Benefit obligation December 31 | 9,483 | 8,372 | $ 7,733
Funded status December 31 | (144) | (578) |
Recognized as: |  |  |
Other assets | 828 | 451 |
Accrued and other current liabilities | (17) | (7) |
Other noncurrent liabilities | $ (955) | $ (1,022) |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost of providing special or contractual termination benefits payable from defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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