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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amounts Recognized in Balance Sheet |  |  |
Current liabilities | $ (84) | $ (81) |
Other Retiree Benefit Plans |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at beginning of year | 960 | 923 |
Service cost | 16 | 13 | $ 13
Interest cost | 38 | 40 | 43
Participants’ contributions | 0 | 0 |
Acquisitions/plan amendments | 0 | 0 |
Actuarial loss (gain) | (88) | 21 |
Foreign exchange impact | (5) | 3 |
Termination benefits | 0 | (3) |
Curtailments and settlements | 0 | 0 |
Benefit payments | (45) | (37) |
Other | 0 | 0 |
Benefit obligations at end of year | 876 | 960 | 923
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | (1) | 0 |
Company contributions | 100 | 37 |
Participants’ contributions | 0 | 0 |
Foreign exchange impact | 0 | 0 |
Settlements and acquisitions | 0 | 0 |
Benefit payments | (45) | (37) |
Other | 0 | 0 |
Fair value of plan assets at end of year | 54 | 0 | 0
Funded Status |  |  |
Benefit obligations at end of year | 876 | 960 | 923
Fair value of plan assets at end of year | 54 | 0 | 0
Net amount recognized | (822) | (960) |
Amounts Recognized in Balance Sheet |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (46) | (44) |
Noncurrent liabilities | (776) | (916) |
Net amount recognized | (822) | (960) |
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Actuarial loss | 239 | 338 |
Transition/prior service cost | (1) | (1) |
Amounts recognized in accumulated other comprehensive income | 238 | 337 |
Accumulated benefit obligation | $ 0 | $ 0 |
Weighted-Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 4.43% | 3.80% |
Long-term rate of return on plan assets |  | 6.60% |
Long-term rate of compensation increase | 3.50% | 3.50% |
ESOP growth rate | 10.00% | 10.00% |
Medical cost trend rate of increase | 6.00% | 6.00% |
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 | 2024 |  |
United States | Pension Plans |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at beginning of year | $ 2,363 | $ 2,298 |
Service cost | 1 | 1 | 1
Interest cost | 86 | 94 | 105
Participants’ contributions | 0 | 0 |
Acquisitions/plan amendments | 0 | 0 |
Actuarial loss (gain) | (139) | 110 |
Foreign exchange impact | 0 | 0 |
Termination benefits | 9 | 24 |
Curtailments and settlements | (4) | 0 |
Benefit payments | (169) | (164) |
Other | 0 | 0 |
Benefit obligations at end of year | 2,147 | 2,363 | 2,298
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 1,812 | 1,646 |
Actual return on plan assets | (101) | 225 |
Company contributions | 30 | 105 |
Participants’ contributions | 0 | 0 |
Foreign exchange impact | 0 | 0 |
Settlements and acquisitions | (4) | 0 |
Benefit payments | (169) | (164) |
Other | 0 | 0 |
Fair value of plan assets at end of year | 1,568 | 1,812 | 1,646
Funded Status |  |  |
Benefit obligations at end of year | 2,147 | 2,363 | 2,298
Fair value of plan assets at end of year | 1,568 | 1,812 | 1,646
Net amount recognized | (579) | (551) |
Amounts Recognized in Balance Sheet |  |  |
Noncurrent assets | 0 | 0 |
Current liabilities | (26) | (24) |
Noncurrent liabilities | (553) | (527) |
Net amount recognized | (579) | (551) |
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Actuarial loss | 940 | 911 |
Transition/prior service cost | 1 | 1 |
Amounts recognized in accumulated other comprehensive income | 941 | 912 |
Accumulated benefit obligation | $ 2,090 | $ 2,293 |
Weighted-Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 4.38% | 3.73% |
Long-term rate of return on plan assets | 6.60% | 6.60% |
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 | (5.00%) |  |
Average annual rates of return for the most recent 5-year period | 5.00% |  |
Average annual rates of return for the most recent 10-year period | 8.00% |  |
Average annual rates of return for the most recent 15-year period | 6.00% |  |
Average annual rates of return for the most recent 25-year period | 7.00% |  |
International | Pension Plans |  |  |
Change in Benefit Obligations |  |  |
Benefit obligations at beginning of year | $ 847 | $ 800 |
Service cost | 14 | 16 | 16
Interest cost | 21 | 22 | 25
Participants’ contributions | 2 | 2 |
Acquisitions/plan amendments | 4 | (6) |
Actuarial loss (gain) | (11) | (11) |
Foreign exchange impact | (40) | 72 |
Termination benefits | 0 | 0 |
Curtailments and settlements | (7) | (11) |
Benefit payments | (42) | (36) |
Other | (1) | (1) |
Benefit obligations at end of year | 787 | 847 | 800
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 575 | 509 |
Actual return on plan assets | (16) | 42 |
Company contributions | 27 | 30 |
Participants’ contributions | 3 | 2 |
Foreign exchange impact | (29) | 40 |
Settlements and acquisitions | (7) | (11) |
Benefit payments | (42) | (36) |
Other | (1) | (1) |
Fair value of plan assets at end of year | 510 | 575 | 509
Funded Status |  |  |
Benefit obligations at end of year | 787 | 847 | 800
Fair value of plan assets at end of year | 510 | 575 | $ 509
Net amount recognized | (277) | (272) |
Amounts Recognized in Balance Sheet |  |  |
Noncurrent assets | 6 | 22 |
Current liabilities | (12) | (13) |
Noncurrent liabilities | (271) | (281) |
Net amount recognized | (277) | (272) |
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Actuarial loss | 226 | 209 |
Transition/prior service cost | 6 | 1 |
Amounts recognized in accumulated other comprehensive income | 232 | 210 |
Accumulated benefit obligation | $ 731 | $ 787 |
Weighted-Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate | 2.80% | 2.53% |
Long-term rate of return on plan assets | 4.06% | 4.04% |
Long-term rate of compensation increase | 2.86% | 2.79% |
ESOP growth rate | 0.00% | 0.00% |
Medical cost trend rate of increase | 0.00% | 0.00% |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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