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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Offsetting Derivative Assets and Liabilities [Abstract]    
Collateral Already Posted, Aggregate Fair Value $ 0 $ 0
Derivative assets 64,000,000 80,000,000
Gross amount eligible for offsetting, derivative assets (12,000,000) (12,000,000)
Net derivative amount, derivative assets 52,000,000 68,000,000
Derivative liabilities 3,152,000,000 3,175,000,000
Gross amount eligible for offsetting, derivative liabilities (12,000,000) (12,000,000)
Net derivative amount, derivative liabilities $ 3,140,000,000 $ 3,163,000,000