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Income Taxes - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Income Taxes [Line Items] |  |
Provisional obligation related to transition tax for accumulated foreign earnings |  | $ 113
State and Local Jurisdiction |  |
Income Taxes [Line Items] |  |
Valuation allowance | $ 207 |

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- Definition [Line Items] for Income Taxes [Table] + References No definition available. + Details
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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Liability + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Details
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