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Derivative instruments (Details Textual) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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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 | $ (202) |
Rate adjustment to LIBOR on interest rate swap agreements [Member] | Three-Month LIBOR [Member] | Minimum [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative, variable interest rate | 0.30% |
Rate adjustment to LIBOR on interest rate swap agreements [Member] | Three-Month LIBOR [Member] | Maximum [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative, variable interest rate | 2.00% |
Derivatives designated as hedging instrument [Member] | Foreign currency forward contracts [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative, notional amount | $ 5,100 | $ 4,600
Derivatives designated as hedging instrument [Member] | Foreign currency option contracts [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative, notional amount | 60 | 74
Derivatives designated as hedging instrument [Member] | Interest rate swap [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative, notional amount |  | 9,450
Derivatives not designated as hedging instrument [Member] | Foreign currency forward contracts [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative, notional amount | $ 335 | $ 757

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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 The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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