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Derivative instruments - Schedule of Hedged Liabilities and Cumulative Amount (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative [Line Items] |  |
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | $ (159) | $ (343)
Current portion of long-term debt |  |
Derivative [Line Items] |  |
Carrying amounts of hedged liabilities | 1,266 | 1,045
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | 16 | 45
Carrying value with discontinued hedging relationships | 51 | 56
Hedging adjustments on discontinued hedging relationships | 51 | 56
Long-term debt |  |
Derivative [Line Items] |  |
Carrying amounts of hedged liabilities | 4,670 | 5,152
Cumulative amounts of fair value hedging adjustments related to the carrying amounts of the hedged liabilities | (175) | (388)
Carrying value with discontinued hedging relationships | 194 | 232
Hedging adjustments on discontinued hedging relationships | $ 94 | $ 132

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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/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A Reference 2: 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. Excludes cumulative basis adjustment related to foreign exchange risk. + 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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