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Income Taxes (Details Textuals) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes Of Non Us Subsidiaries [Line Items] |  |  |  |
Accumulated earnings intended to be permanently reinvested outside the U.S. | $ 10,400 |  |  |
Income Taxes [Line items] |  |  |  |
U.S. statutory federal income tax rate | 35.00% | 35.00% | 35.00% |
Aggregate of federal taxes | $ 3,200 |  |  |
Income taxes paid | 3,000 | $ 3,400 | $ 2,500 |
Unrecognized tax benefits | 974 | 870 | 909 | $ 1,044
Unrecognized tax benefits as a result of potential resolutions of prior years' tax | 449 |  |  |
Unrecognized tax benefits that affect effective tax rate | 516 | 502 | 412 |
Unrecognized tax benefits, amounts recorded to equity | 309 |  |  |
Unrecognized tax benefits impact not possible to quantify | 0 |  |  |
Unrecognized tax benefits income tax penalties and interest expense | 9 | 38 | $ (19) |
Unrecognized tax benefits income tax penalties and interest accrued | 173 | $ 164 |  |
Tax Benefit Recognized In Subsequent Period | $ 289 |  |  |
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 domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: 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=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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=65882285&loc=d3e32698-109319 + Details
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