Derivative instruments - Summary of Unrealized Gains and Losses Recognized in AOCI (Details) - Cash flow hedge - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ 178	$ (71)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	202	0
Cross-currency swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	(24)	(40)
Forward interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ 0	$ (31)

Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A

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