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Retirement Plans and Other Retiree Benefits - Summary of Defined Benefit and Other Retiree Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts Recognized in Balance Sheet |  |  |
Current liabilities | $ (81) | $ (80) |
Other Retiree Benefit Plans |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at beginning of year | 923 | 862 |
Service cost | 13 | 13 | $ 14
Interest cost | 40 | 43 | 44
Participants’ contributions | 0 | 0 |
Acquisitions/plan amendments | 0 | 0 |
Actuarial loss (gain) | 21 | 39 |
Foreign exchange impact | 3 | 1 |
Termination benefits | (3) | 1 |
Curtailments and settlements | 0 | 0 |
Benefit payments | (37) | (36) |
Other | 0 | 0 |
Benefit obligations at end of year | 960 | 923 | 862
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 0 | 14 |
Actual return on plan assets | 0 | 1 |
Company contributions | 37 | 21 |
Participants’ contributions | 0 | 0 |
Foreign exchange impact | 0 | 0 |
Settlements and acquisitions | 0 | 0 |
Benefit payments | (37) | (36) |
Other | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | 14
Funded Status |  |  |
Benefit obligations at end of year | 960 | 923 | 862
Fair value of plan assets at end of year | 0 | 0 | 14
Net amount recognized | (960) | (923) |
Amounts Recognized in Balance Sheet |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (44) | (44) |
Noncurrent liabilities | (916) | (879) |
Net amount recognized | (960) | (923) |
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Actuarial loss | 338 | 330 |
Transition/prior service cost | (1) | (2) |
Amounts recognized in accumulated other comprehensive income | 337 | 328 |
Accumulated benefit obligation | $ 0 | $ 0 |
Weighted-Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 3.80% | 4.41% |
Long-term rate of return on plan assets |  | 6.80% |
Long-term rate of compensation increase | 3.50% | 0.00% |
ESOP growth rate | 10.00% | 10.00% |
Medical cost trend rate of increase | 6.00% | 6.33% |
Assumed medical cost trend rates [Abstract] |  |  |
Medical cost trend rate assumed for next fiscal year | 6.00% |  |
Ultimate medical cost trend rate | 4.75% |  |
Year which ultimate medical cost trend rate is reached | 2023 |  |
United States | Pension Plans |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at beginning of year | $ 2,298 | $ 2,201 |
Service cost | 1 | 1 | 2
Interest cost | 94 | 105 | 100
Participants’ contributions | 0 | 0 |
Acquisitions/plan amendments | 0 | 0 |
Actuarial loss (gain) | 110 | 129 |
Foreign exchange impact | 0 | 0 |
Termination benefits | 24 | 3 |
Curtailments and settlements | 0 | 0 |
Benefit payments | (164) | (141) |
Other | 0 | 0 |
Benefit obligations at end of year | 2,363 | 2,298 | 2,201
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 1,646 | 1,624 |
Actual return on plan assets | 225 | 88 |
Company contributions | 105 | 75 |
Participants’ contributions | 0 | 0 |
Foreign exchange impact | 0 | 0 |
Settlements and acquisitions | 0 | 0 |
Benefit payments | (164) | (141) |
Other | 0 | 0 |
Fair value of plan assets at end of year | 1,812 | 1,646 | 1,624
Funded Status |  |  |
Benefit obligations at end of year | 2,363 | 2,298 | 2,201
Fair value of plan assets at end of year | 1,812 | 1,646 | 1,624
Net amount recognized | (551) | (652) |
Amounts Recognized in Balance Sheet |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (24) | (24) |
Noncurrent liabilities | (527) | (628) |
Net amount recognized | (551) | (652) |
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Actuarial loss | 911 | 962 |
Transition/prior service cost | 1 | 2 |
Amounts recognized in accumulated other comprehensive income | 912 | 964 |
Accumulated benefit obligation | $ 2,293 | $ 2,230 |
Weighted-Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 3.73% | 4.27% |
Long-term rate of return on plan assets | 6.60% | 6.80% |
Long-term rate of compensation increase | 3.50% | 3.50% |
ESOP growth rate | 0.00% | 0.00% |
Medical cost trend rate of increase | 0.00% | 0.00% |
Long-term rate of return on plan assets [Abstract] |  |  |
Average annual rates of return for the most recent 1-year period | 14.00% |  |
Average annual rates of return for the most recent 5-year period | 8.00% |  |
Average annual rates of return for the most recent 10-year period | 6.00% |  |
Average annual rates of return for the most recent 15-year period | 8.00% |  |
Average annual rates of return for the most recent 25-year period | 8.00% |  |
International | Pension Plans |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at beginning of year | $ 800 | $ 802 |
Service cost | 16 | 16 | 20
Interest cost | 22 | 25 | 28
Participants’ contributions | 2 | 2 |
Acquisitions/plan amendments | (6) | 1 |
Actuarial loss (gain) | (11) | 76 |
Foreign exchange impact | 72 | (47) |
Termination benefits | 0 | 0 |
Curtailments and settlements | (11) | (37) |
Benefit payments | (36) | (36) |
Other | (1) | (2) |
Benefit obligations at end of year | 847 | 800 | 802
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 509 | 520 |
Actual return on plan assets | 42 | 46 |
Company contributions | 30 | 54 |
Participants’ contributions | 2 | 2 |
Foreign exchange impact | 40 | (43) |
Settlements and acquisitions | (11) | (33) |
Benefit payments | (36) | (36) |
Other | (1) | (1) |
Fair value of plan assets at end of year | 575 | 509 | 520
Funded Status |  |  |
Benefit obligations at end of year | 847 | 800 | 802
Fair value of plan assets at end of year | 575 | 509 | $ 520
Net amount recognized | (272) | (291) |
Amounts Recognized in Balance Sheet |  |  |
Noncurrent assets | 22 | 8 |
Current liabilities | (13) | (12) |
Noncurrent liabilities | (281) | (287) |
Net amount recognized | (272) | (291) |
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Actuarial loss | 209 | 254 |
Transition/prior service cost | 1 | 5 |
Amounts recognized in accumulated other comprehensive income | 210 | 259 |
Accumulated benefit obligation | $ 787 | $ 739 |
Weighted-Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 2.53% | 2.59% |
Long-term rate of return on plan assets | 4.04% | 4.14% |
Long-term rate of compensation increase | 2.79% | 2.58% |
ESOP growth rate | 0.00% | 0.00% |
Medical cost trend rate of increase | 0.00% | 0.00% |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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 (h)(2) -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 50 -Paragraph 1 -Subparagraph (a)(2) -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 change, classified as other. + References No definition available. + 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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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + 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)(4) -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) plan assets 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -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 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (d)(5)(ii) -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 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement. + 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 Ultimate trend rate for health care cost for defined benefit postretirement 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- References No definition available. + Details
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- Definition Year ultimate health care cost trend rate is expected to be reached, in CCYY format. + 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 Reference 4: 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 + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: 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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