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Income Taxes, Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits | $ 941 | $ 936 | $ 964 | $ 989
Tax refund claim not presented in our balance sheets | (274) | (433) |  |
Other | 77 | (5) |  |
Uncertain tax position liabilities presented in our balance sheets | $ 744 | $ 498 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition The total amount recognized for uncertain tax positions as of the balance sheet date, including current and noncurrent portions. + References No definition available. + Details
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