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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Offsetting Derivative Assets and Liabilities [Abstract]    
Collateral Already Posted, Aggregate Fair Value  
Derivative assets 106 $ 97
Gross amount eligible for offsetting, derivative assets (7) (11)
Net derivative amount, derivative assets 99 86
Derivative liabilities 2,611 2,568
Gross amount eligible for offsetting, derivative liabilities (7) (11)
Net derivative amount, derivative liabilities $ 2,604 $ 2,557