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Derivative Instruments (Effective Portion of Unrealized Gain (Loss)) (Details) - Derivatives in cash flow hedging relationships [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract] |  |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | $ 192 | $ (176) | $ 150
Foreign currency contracts [Member] |  |  |
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract] |  |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | (402) | 115 | 425
Cross-currency swap contracts [Member] |  |  |
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract] |  |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | 581 | (281) | (275)
Forward interest rate contract [Member] |  |  |
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges contracts [Abstract] |  |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | $ 13 | $ (10) | $ 0

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- References No definition available. + Details
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