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Pension, Savings and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution savings plan, contribution expense recognized | $ 28 | $ 28 | $ 57 | $ 58
Postretirement benefits expense (credit) | 3 | $ (1) | 6 | $ (3)
Non-U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions to pension plans | 8 |  | 19 |
Minimum | Non-U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected contribution to funded pension plans in current year | 25 |  | 25 |
Maximum | Non-U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected contribution to funded pension plans in current year | $ 50 |  | $ 50 |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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