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Income Taxes - Narrative (Details) $ in Billions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Minimum |
Income Taxes |
Number of tax years open for state tax audit (in years) | 3 years
Maximum |
Income Taxes |
Number of tax years open for state tax audit (in years) | 5 years
Domestic Tax Authority |
Income Taxes |
Operating loss carryforwards subject to limitation | $ 1.9
Domestic Tax Authority | Earliest Tax Year |
Income Taxes |
Open tax year | 2014
Net Operating Loss And Other Carryforwards | Earliest Tax Year |
Income Taxes |
Open tax year | 2005
Net Operating Loss And Other Carryforwards | Latest Tax Year |
Income Taxes |
Open tax year | 2013

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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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