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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

Derivative, Notional Amount, Increase (Decrease)

+ References

No definition available.

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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

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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))
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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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-Paragraph 4C
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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
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