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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Other Income (Expense), Net
Deposit Liabilities, Description	0	0	0	21
External services	$ 3	$ 2	$ 6	$ 6
Interest income	5	6	10	12
Gains (losses) on investments	(11)	6	(6)	(1)
Miscellaneous	2	0	1	0
Total other income (expense), net	(1)	$ 14	11	$ 38
Increase in Other Income/Expense	15		27
Increase in Gains (Losses)	21
SERP
Other Income (Expense), Net
Gains (losses) on investments	$ 12		$ 10

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