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Derivative instruments - Effect of Fair Value Hedge Relationships on Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2023
Fair Value Hedging | Interest Expense | Designated as hedging instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Effect of fair value relationships | $ (8) | $ (13)

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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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