XML 91 R78.htm IDEA: XBRL DOCUMENT v3.8.0.1
Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($)
Dec. 31, 2017
Sep. 30, 2017
Offsetting Derivative Assets and Liabilities [Abstract]    
Collateral Already Posted, Aggregate Fair Value $ 0 $ 0
Derivative assets 130,000,000 91,000,000
Gross amount eligible for offsetting, derivative assets (27,000,000) (16,000,000)
Net derivative amount, derivative assets 103,000,000 75,000,000
Derivative liabilities 3,023,000,000 2,105,000,000
Gross amount eligible for offsetting, derivative liabilities (27,000,000) (16,000,000)
Net derivative amount, derivative liabilities $ 2,996,000,000 $ 2,089,000,000