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Acquisitions and Divestitures - Divestitures (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Discontinued Operations and Disposal Groups [Abstract] |
Aggregate operating income of divested businesses | $ 10

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration