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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amount recognized, asset $ 5 $ 23
Gross amount eligible for offsetting, asset (5) (9)
Net amount, asset 0 14
Gross amount recognized, liability 1,213 1,109
Gross amount eligible for offsetting, liability (5) (9)
Net amount, liability $ 1,208 $ 1,100