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Derivative instruments - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ (47)
Derivatives designated as hedging instruments [Member] | Foreign currency forward contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Notional amount	5,000	$ 4,500	$ 4,600
Derivatives designated as hedging instruments [Member] | Foreign currency option contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Notional amount		21	74
Derivatives designated as hedging instruments [Member] | Interest rate swap [Member]
Derivative Instruments Gain Loss [Line Items]
Notional amount	9,600	11,000
Derivatives not designated as hedging instruments [Member] | Foreign currency forward contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Notional amount	$ 1,200	$ 737	$ 757
Notes [Member] | Two Point One Two Five Percent Euro Notes Due 2019 [Member]
Derivative Instruments Gain Loss [Line Items]
Interest rate, stated percentage	2.125%

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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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

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