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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Debt Instrument
Interest Expense	$ 14	$ 27	$ 28
Short-term debt
Short-term debt, net	1,875	1,875		$ 922
Current maturities of power bonds	1,552	1,552		1,030
Current maturities of long-term debt of variable interest entities	40	40		39
Current maturities of notes payable	22	22		23
Total current debt outstanding, net	3,489	3,489		2,014
Long-term debt
Long-term power bonds	17,491	17,491		19,225	[1]
Long-term debt of variable interest entities	1,069	1,069		1,089
Long-term notes payable	1	1
Unamortized discounts, premiums, issues costs, and other	121	121		(131)
Total long-term debt, net	18,439	18,439		20,183
Total outstanding debt	$ 21,928	$ 21,928		$ 22,197
[1] Includes net exchange gain from currency transactions of $183 million and $191 million at March 31, 2020, and September 30, 2019, respec

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