Derivative instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Length of time hedged in foreign currency contracts	3 years
Foreign currency forward contracts \| Designated as Hedging Instrument
Derivative [Line Items]
Notional amounts	$ 7,300	$ 7,200
Foreign currency forward contracts \| Derivatives not designated as hedging instrument
Derivative [Line Items]
Notional amounts	41	148
Interest Rate Swap \| Designated as Hedging Instrument
Derivative [Line Items]
Notional amounts	$ 6,700	$ 6,700

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
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- Definition

Maximum period of hedging exposure to variability in future cash flows for forecasted transaction of foreign currency cash flow hedge, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transaction for payment of variable interest on existing financial instrument.

+ References

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-Topic 815
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