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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Other Income (Expense), Net
Change in other income (expense)	$ (26)
Other income		$ 21	$ 0
Proceeds from Other Deposits	0	21
Interest income	18	25	23
External services	12	13	14
Gain (Loss) on Investments	9	3	6
Miscellaneous		0	7
Miscellaneous	(3)
Total other income (expense), net	36	$ 62	$ 50
Change in interest income	$ 7

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