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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
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)