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Other Income (Expense), Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other Income (Expense), Net        
Deposit Liabilities, Description  
External services $ 3 $ 3 $ 9 $ 9
Interest income 3 7 14 19
Gains (losses) on investments 10 3 4 2
Miscellaneous 0 1 0 1
Total other income (expense), net 16 $ 14 27 52
Increase in Other Income/Expense 2   $ 25  
Increase in Gains (Losses) 21      
Bellefont deposit revenue       $ 21
Increase (Decrease) in Gains (Losses) on Investments 7      
Increase (Decrease) Interest Income, Nonoperating, Net $ 4