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Derivative instruments - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 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 | $ (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 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 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 + 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://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 + Details
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