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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