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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes (Textuals) |  |  |  |  |
Unrecognized tax benefits change as a result of potential resolutions of prior years' tax | $ 319 |  |  | $ 319 |
Actual tax rates | 22.40% |  | 31.30% | 22.00% | 31.60%
Unrecognized tax benefits that, if recognized, could impact effective tax rate. | $ 286 |  |  | $ 286 |
U.S. Tax Act Discrete Net Charge |  | $ 2,600 |  |  |
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=84230637&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=84230637&loc=d3e32687-109319 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + 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 (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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