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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 Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 14.00% | 19.10% | 15.80% | 18.50%
Increase in uncertain tax positions |  |  | $ 7 |
Amount of liability for uncertain tax positions that would impact the effective tax rate if recognized | $ 161 |  | 161 |
Other Noncurrent Liabilities [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Liability for uncertain tax positions, noncurrent | 208 |  | 208 |
Liability for uncertain tax positions, interest | 30 |  | 30 |
Liability for uncertain tax positions, penalties | $ 21 |  | $ 21 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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