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Derivative instruments (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Interest expense, net [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Unrealized gain (loss) on interest rate swaps | $ (17) | $ (61) | $ 1 | $ 137 |
Unrealized gain (loss) on the hedged debt | 17 | $ 61 | (1) | $ (137) |
Foreign currency forward contracts [Member] | Derivatives designated as hedging instrument [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, notional amount | 4,000 |  | 4,000 |  | $ 3,400
Foreign currency forward contracts [Member] | Derivatives not designated as hedging instrument [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, notional amount | 779 |  | 779 |  | 666
Foreign currency option contracts [Member] | Derivatives designated as hedging instrument [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, notional amount | 131 |  | 131 |  | 608
Forward interest rate contract [Member] | Derivatives designated as hedging instrument [Member] | Cash flow hedge [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, notional amount, increase (decrease) | 550 |  |  |  |
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 | (172) |  | (172) |  |
Other Contract [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Amounts expected to be reclassified from AOCI into earnings over the next 12 months, forward interest rate contracts | $ (1) |  | (1) |  |
Interest rate swap [Member] | Derivatives designated as hedging instrument [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 6,650
Derivative, notional amount, increase (decrease) |  |  | $ (850) |  |
Rate adjustment to LIBOR on interest rate swap agreements [Member] | Three-Month London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, variable interest rate | 0.40% |  | 0.40% |  |
Rate adjustment to LIBOR on interest rate swap agreements [Member] | Three-Month London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, variable interest rate | 0.30% |  | 0.30% |  | 0.40%
Rate adjustment to LIBOR on interest rate swap agreements [Member] | Three-Month London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, variable interest rate | 1.40% |  | 1.40% |  | 2.00%
3.625% 2024 Notes, 3.125% 2025 Notes, and 2.60% 2026 Notes [Member] | Interest rate swap [Member] | Derivatives designated as hedging instrument [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Derivative, notional amount, increase (decrease) |  |  | $ 3,650 |  |
3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Interest rate, stated percentage | 3.625% |  | 3.625% |  |
3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Interest rate, stated percentage | 3.125% |  | 3.125% |  |
2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Interest rate, stated percentage | 2.60% |  | 2.60% |  |

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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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve 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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