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Employee Benefit Plans - Change in Benefit Obligation and Plan Assets, Funded Status, Amounts Recognized in Balance Sheet, and ABO in Excess of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amounts recognized in the Consolidated Balance Sheets |  |  |
Noncurrent assets | $ 178 | $ 140 |
Pension Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation as of January 1 | 2,855 | 3,223 |
Net service cost | 7 | 7 | $ 8
Interest cost | 85 | 81 | 91
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 4 |
Actuarial loss | 341 | (232) |
Benefits paid | (180) | (185) |
Plan participant contributions | 1 | 1 |
Currency translation adjustments | 19 | (44) |
Benefit obligation as of December 31 | 3,128 | 2,855 | 3,223
Accumulated benefit obligation as of December 31 | 3,117 | 2,843 |
Amounts recognized in the Consolidated Balance Sheets |  |  |
Defined Benefit Plan, Benefit Obligation | (693) | (633) |
Noncurrent assets | 178 | 140 |
Current liabilities | (13) | (14) |
Noncurrent liabilities | (858) | (759) |
Net amounts recognized | (693) | (633) |
Prior service cost | 20 | 21 |
Total | 20 | 21 |
Amounts recognized in the accumulated other comprehensive loss |  |  |
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation | 2,222 | 2,016 |
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation | 2,217 | 2,012 |
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets | 1,380 | 1,271 |
U.S. Pension Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation as of January 1 | 1,763 | 1,950 |
Net service cost | 0 | 0 | 0
Interest cost | 66 | 61 | 71
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0 |
Actuarial loss | 229 | (149) |
Benefits paid | (104) | (99) |
Plan participant contributions | 0 | 0 |
Currency translation adjustments | 0 | 0 |
Benefit obligation as of December 31 | 1,954 | 1,763 | 1,950
Accumulated benefit obligation as of December 31 | 1,954 | 1,763 |
Amounts recognized in the Consolidated Balance Sheets |  |  |
Defined Benefit Plan, Benefit Obligation | (577) | (494) |
Noncurrent assets | 0 | 0 |
Current liabilities | 0 | 0 |
Noncurrent liabilities | (577) | (494) |
Net amounts recognized | (577) | (494) |
Prior service cost | 0 | 0 |
Total | 0 | 0 |
Foreign Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation as of January 1 | 1,092 | 1,273 |
Net service cost | 7 | 7 | 8
Interest cost | 19 | 20 | 20
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 4 |
Actuarial loss | 112 | (83) |
Benefits paid | (76) | (86) |
Plan participant contributions | 1 | 1 |
Currency translation adjustments | 19 | (44) |
Benefit obligation as of December 31 | 1,174 | 1,092 | 1,273
Accumulated benefit obligation as of December 31 | 1,163 | 1,080 |
Amounts recognized in the Consolidated Balance Sheets |  |  |
Defined Benefit Plan, Benefit Obligation | (116) | (139) |
Noncurrent assets | 178 | 140 |
Current liabilities | (13) | (14) |
Noncurrent liabilities | (281) | (265) |
Net amounts recognized | (116) | (139) |
Prior service cost | 20 | 21 |
Total | 20 | 21 |
Postretirement Benefits [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation as of January 1 | 18 | 21 |
Interest cost | 1 | 0 | 1
Actuarial loss | 0 | (3) |
Benefits paid | (2) | (1) |
Plan participant contributions | 0 | 1 |
Benefit obligation as of December 31 | 17 | 18 | 21
Amounts recognized in the Consolidated Balance Sheets |  |  |
Defined Benefit Plan, Benefit Obligation | (17) | (18) |
Current liabilities | (2) | (2) |
Noncurrent liabilities | (15) | (16) |
Net amounts recognized | (17) | (18) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 7 | 7 |
Prior service cost | (3) | (8) |
Total | 4 | (1) |
Postemployment Benefit Plans Defined Benefit [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation as of January 1 | 139 | 142 |
Net service cost | 31 | 43 | 34
Interest cost | 3 | 3 | 2
Actuarial loss | (11) | (3) |
Benefits paid | (35) | (40) |
Currency translation adjustments | (1) | (6) |
Benefit obligation as of December 31 | 126 | 139 | $ 142
Amounts recognized in the Consolidated Balance Sheets |  |  |
Defined Benefit Plan, Benefit Obligation | (126) | (139) |
Current liabilities | (30) | (37) |
Noncurrent liabilities | (96) | (102) |
Net amounts recognized | (126) | (139) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | (38) | (28) |
Prior service cost | (6) | (6) |
Total | $ (44) | $ (34) |

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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=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&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://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=118255775&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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- Definition Amount of cost recognized for passage of time related to 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&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=118257860&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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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