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Derivative instruments - Hedged Liabilities and Related Cumulative Basis Adjustments (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | $ (436) | $ (437)
Current portion of long-term debt |  |
Derivative [Line Items] |  |
Hedged Liability, Fair Value Hedge | 1,416 | 82
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | 16 | 82
Carrying value with discontinued hedging relationships | 80 | 82
Hedging adjustments on discontinued hedging relationships | 80 | 82
Long-term debt |  |
Derivative [Line Items] |  |
Hedged Liability, Fair Value Hedge | 4,688 | 6,017
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | (452) | (519)
Carrying value with discontinued hedging relationships | 318 | 357
Hedging adjustments on discontinued hedging relationships | $ 218 | $ 257

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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