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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Sep. 30, 2019
Debt Instrument
Interest Expense		$ 14
Short-term debt
Short-term debt, net		895	$ 922
Current maturities of power bonds		1,029	1,030
Current maturities of long-term debt of variable interest entities		39	39
Current maturities of notes payable		22	23
Total current debt outstanding, net		1,985	2,014
Long-term debt
Long-term power bonds	[1]	19,065	19,225
Long-term debt of variable interest entities		1,089	1,089
Long-term notes payable		1
Unamortized discounts, premiums, issues costs, and other		(124)	(131)
Total long-term debt, net		20,030	20,183
Total outstanding debt		$ 22,015	$ 22,197
[1] Includes net exchange gain from currency transactions of $133 million and $191 million at December 31, 2019, and September 30, 2019, respec

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