Derivative instruments (Effective Portion of Unrealized Gain (Loss)) (Details) - Cash flow hedge - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ 45	$ 16	$ 168	$ 93
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	324	136	654	273
Cross-currency swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ (279)	$ (120)	$ (486)	$ (180)

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration