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Other Income (Expense), Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Other Income (Expense), Net          
Deposit Liabilities, Description 0 0 21156894   0
Deposit Liabilities, Description     $ 21    
External services $ 3 $ 2 9   $ 10
Interest income 7 6 19   17
Gains (losses) on investments 3 1 2   4
Miscellaneous 1 2 1   3
Total other income (expense), net 14 $ 11 52 $ 34 $ 34
Increase in Other Income/Expense 3   $ 18    
Increase in Gains (Losses) 2        
Increase in Interest Income $ 1