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Income Taxes Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |
Effective income tax, percent | 50.60% | 14.30% | 17.10%
Interest expense and penalties included in other income (expense), net | $ (28) | $ (1) | $ (4)
Net operating loss carryforward recognized | 32 | 28 | $ 79
Accrued interest and penalties | 60 | 34 |
Operating loss carryforwards | 219 |  |
Reinvestment of future remittances of undistributed earnings of foreign subsidiaries | 8,484 |  |
Unrecognized tax benefits, interest on income tax expense | 232 | $ 209 |
United States |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforwards | 106 |  |
Foreign Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforwards | 113 |  |
Operating loss carryforwards, valuation allowance | 36 |  |
Tax credit carryforward, amount | 43 |  |
Tax credit carryforward, valuation allowance | $ 40 |  |

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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 estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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