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
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

Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented.

+ References

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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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

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Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Amount of projected 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 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921

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