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Derivative instruments and hedging activities - Fair Values by Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Derivatives designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets $ 124 $ 135
Derivative liabilities 0 0
Derivatives NOT designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 3
Derivative liabilities 0 (1)
Interest rate contracts | Derivatives designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 124 135
Derivative liabilities 0 0
Interest rate contracts | Derivatives NOT designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 3
Derivative liabilities 0 0
Foreign exchange contracts | Derivatives NOT designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 0
Derivative liabilities $ 0 $ (1)