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Derivative instruments (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments Gain Loss [Line Items] |  |  |
Length of time hedged in foreign currency contracts | 3 years |  |
Interest expense, net [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Offsetting unrealized gain (loss) on related interest rate swaps | $ (85) | $ (34) | $ 48
Unrealized gain (loss) on the hedged debt | 85 | 34 | (48)
Foreign currency option contracts [Member] | Derivatives designated as hedging instruments [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | 74 | 608 | 225
Foreign currency forward and option contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount of terminated derivatives |  |  | 2,300
Foreign currency forward and option contracts [Member] | Net cash provided by operating activities [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Proceeds from counterparties on termination of derivatives |  |  | 340
Foreign currency and cross currency swap contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amounts expected to be reclassified from accumulated other comprehensive income into earnings over the next 12 months - gains on foreign currency and cross currency swap | 175 |  |
Interest rate swap [Member] | Derivatives designated as hedging instruments [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | 9,450 | 6,650 |
Foreign currency forward contracts [Member] | Derivatives designated as hedging instruments [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | 4,600 | 3,400 | 3,300
Foreign currency forward contracts [Member] | Derivatives not designated as hedging instruments [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | $ 757 | $ 666 | $ 911

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- Definition Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount + References No definition available. + Details
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- Definition Proceeds from Counterparties on Termination of Derivatives + 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://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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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + 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 (a) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments. + 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 (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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