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Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Offsetting Derivative Assets and Liabilities [Abstract]    
Derivative assets $ 79 $ 57
Gross amount eligible for offsetting, derivative assets (18) (16)
Net derivative amount, derivative assets 61 41
Derivative liabilities 2,829 2,936
Gross amount eligible for offsetting, derivative liabilities (18) (16)
Net derivative amount, derivative liabilities $ 2,811 $ 2,920