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Income Taxes - Deferred Income Tax Valuation Allowance Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Tax Assets Valuation Allowance [Roll Forward] |  |  |
Beginning balance of deferred income tax valuation allowance | $ 119 | $ 126 | $ 122
Charges against goodwill | 1 | 0 | 15
Decreases | (1) | (7) | (11)
Ending balance of deferred income tax valuation allowance | $ 119 | $ 119 | $ 126

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- Definition Deferred Tax Assets Valuation Allowance [Roll Forward] + References No definition available. + Details
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- Definition Valuation Allowance, Deferred Tax Asset, Additions, Charged to Goodwill + References No definition available. + Details
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- Definition Valuation Allowance, Deferred Tax Asset, Deductions + 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://fasb.org/us-gaap/role/ref/legacyRef -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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