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Derivative instruments - Narrative (Details) - Fair Value Hedging - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
Loans Payable And Other Financial Liabilities Current |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Carrying amount of the hedged item | $ 214 | $ 214 | $ 59 |
Fair value hedge relationships less than | 1 | 1 |  | $ 1
Designated as hedging instrument | Interest Expense |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Effect of fair value relationships | $ 4 | $ 9 |  |

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