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Derivative instruments (Textual) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Foreign currency and cross currency swap contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amounts expected to be reclassified from AOCI into earnings over the next 12 months, foreign currency and cross-currency swaps | $ (110) |  |
Derivatives designated as hedging instruments [Member] | Foreign currency forward contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 4,500 | $ 4,600 | $ 3,400
Derivatives designated as hedging instruments [Member] | Foreign currency option contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 21 | 74 | 608
Derivatives designated as hedging instruments [Member] | Interest rate swap [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | 10,950 | 9,450 |
Derivative entered during the period | 1,500 |  |
Derivatives not designated as hedging instruments [Member] | Foreign currency forward contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, notional amount | $ 737 | $ 757 | $ 666

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- Definition Derivative, Monetary Amount + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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