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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Taxes (Textuals) |  |  |  |
Unrecognized tax benefits as a result of potential resolutions of prior years' tax | $ 237 |  | $ 237 |
Unrecognized tax benefits, amounts recorded to equity | $ 21 |  | $ 21 |
Actual tax rates | 33.20% | 33.90% | 33.80% | 34.00%
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 | 2014 |  |  |

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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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