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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | $ 75 |  |
Balance at end of year | 90 | $ 75 |
Deferred tax asset valuation allowance |  |  |
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | 75 | 77 | $ 65
Charged to income tax expense | 15 | 5 | 12
Charged to Retained earnings | 0 | (7) | 0
Balance at end of year | $ 90 | $ 75 | $ 77

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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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