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Pension and Postretirement Benefit Plans - Aggregate Funding Levels of Defined Benefit Pension Plans (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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UNITED STATES |  |
Plans with fair value of plan assets in excess of obligations: |  |
Accumulated benefit obligation | $ 16 | $ 0
Projected benefit obligation | 16 |
Fair value of plan assets | 16 |
Plans with obligations in excess of fair value of plan assets: |  |
Accumulated benefit obligation | 1,714 | 1,682
Projected benefit obligation | 1,714 | 1,682
Fair value of plan assets | 1,497 | 1,454
Foreign Plan [Member] |  |
Plans with fair value of plan assets in excess of obligations: |  |
Accumulated benefit obligation | 15 | 15
Projected benefit obligation | 15 | 15
Fair value of plan assets | 18 | 17
Plans with obligations in excess of fair value of plan assets: |  |
Accumulated benefit obligation | 334 | 272
Projected benefit obligation | 362 | 294
Fair value of plan assets | $ 53 | $ 34

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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