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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Offsetting Derivative Assets and Liabilities [Abstract]    
Derivative assets $ 65 $ 97
Gross amount eligible for offsetting, derivative assets (15) (11)
Net derivative amount, derivative assets 50 86
Derivative liabilities 2,609 2,568
Gross amount eligible for offsetting, derivative liabilities (15) (11)
Net derivative amount, derivative liabilities $ 2,594 $ 2,557