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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes (Textual) [Abstract] |  |  |  |
Income tax provision | $ 19 | $ 22 | $ 49 | $ 52
Effective tax rate | 17.40% | 17.50% | 17.60% | 17.70%
Likelihood of uncertain tax positions |  |  | greater than 50% |
Unrecognized tax benefits | $ 42 |  | $ 42 |
Interest accrued for unrecognized tax benefits (less than $1 million) | $ 1 |  | $ 1 |

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- Definition Amount of interest expense accrued for an underpayment of income taxes. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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