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Derivative instruments (Effective Portion of Unrealized Gain (Loss)) (Details) - Cash flow hedge - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total unrealized gains (losses) | $ (71) | $ 56
Foreign currency forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total unrealized gains (losses) | 0 | 78
Cross-currency swap contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total unrealized gains (losses) | (40) | (22)
Forward Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total unrealized gains (losses) | $ (31) | $ 0

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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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