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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | $ 159 | $ (61) | $ 127
Foreign currency contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | 373 | (251) | 148
Cross-currency swap contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total unrealized gains (losses) | $ (214) | $ 190 | $ (21)

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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 http://asc.fasb.org/extlink&oid=124509347&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 http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 + Details
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