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Income Taxes, Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | $ 55 |  |
Balance at end of year | 65 | $ 55 |
Deferred tax asset valuation allowance |  |  |
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | 55 | 53 | $ 43
Charged to income tax expense | 10 | 2 | 10
Balance at end of year | $ 65 | $ 55 | $ 53

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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=65882285&loc=d3e32537-109319 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Details
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