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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amount recognized, asset $ 18 $ 34
Gross amount eligible for offsetting, asset (9) (12)
Net amount, asset 9 22
Gross amount recognized, liability 41 144
Gross amount eligible for offsetting, liability (9) (12)
Net amount, liability $ 32 $ 132