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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Other Income (Expense), Net      
Change in other income (expense) $ 12    
Other income   $ 0 $ 0
Proceeds from Other Deposits 21    
Interest income 25 23 23
External services 13 14 14
Gain (Loss) on Investments 3 6 9
Gains (losses) on investments 2    
Miscellaneous   7 10
Miscellaneous 0    
Total other income (expense), net 62 $ 50 $ 56
Gain (Loss) on Disposition of Assets $ 5