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Derivative instruments - (Effective Portion of Unrealized Gain (Loss)) (Details) - Cash flow hedge [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | $ 84 | $ 159 | $ (61)
Foreign currency forward contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | 308 | 373 | (251)
Cross-currency swap contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | (219) | (214) | 190
Forward interest rate contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | $ (5) | $ 0 | $ 0

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