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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes (Textuals) |  |  |  |
Unrecognized tax benefits as a result of potential resolutions of prior years' tax | $ 431 |  | $ 431 |
Unrecognized tax benefits, amounts recorded to equity | $ 288 |  | $ 288 |
Actual tax rates | 34.70% | 34.20% | 34.20% | 34.40%
Internal Revenue Service (IRS) [Member] | Earliest Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Open tax years by major tax jurisdiction |  |  | 2008 |
Internal Revenue Service (IRS) [Member] | Latest Year [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Open tax years by major tax jurisdiction |  |  | 2011 |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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