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Derivative instruments (Effective Portion of Unrealized Gain (Loss)) (Details) - Cash flow hedge [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Effective portion of the unrealized gain (loss) recognized in Other Comprehensive Income for our derivative instruments designated as cash flow hedges |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | $ 149 | $ 17
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 |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | (89) | (47)
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 |  |
Unrealized gain (loss) on derivative instruments recognized in Other Comprehensive Income, effective portion, net | $ 238 | $ 64

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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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