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Pensions Benefit Plans and Other Postretirement Benefits - U.S. Plan Assets By Hierarchy (Details) - Pension Benefit Plans - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Minimum |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 10.00% |  |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value |  |  | $ 10
U.S. |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 1,094 | $ 1,394 | 1,654
U.S. | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 62.00% |  |
U.S. | Debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 32.00% |  |
U.S. | Real estate and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 6.00% |  |
Non-U.S. |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 843 | 975 | $ 1,011
Investments measured at net asset value | 763 | 906 |
Non-U.S. | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 9 | 9 |
Non-U.S. | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 16.00% |  |
Non-U.S. | Debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 41 | 33 |
Defined Benefit Plan, Target Plan Asset Allocations | 60.00% |  |
Non-U.S. | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 30 | 27 |
Non-U.S. | Real estate and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 24.00% |  |
Non-U.S. | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 43 | 42 |
Non-U.S. | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 9 | 9 |
Non-U.S. | Level 1 | Debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 34 | 33 |
Non-U.S. | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 37 | 27 |
Non-U.S. | Level 2 | Debt securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | 7 |  |
Non-U.S. | Level 2 | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets at fair value | $ 30 | $ 27 |

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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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