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Debt and Other Obligations Debt Outstanding (Details) - USD ($)	3 Months Ended			9 Months Ended
	Jun. 30, 2019	Sep. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Debt Instrument
Interest Expense	$ 14,000,000			$ 42,000,000	$ 43,000,000
Short-term debt
Short-term debt, net	1,444,186,406	$ 1,216,000,000		1,444,186,406
Current maturities of power bonds	1,029,513,817	1,032,000,000		1,029,513,817
Long-term Debt, Current Maturities	38,623,895			38,623,895
Current maturities of long-term debt of variable interest entities	38,623,895	38,000,000		38,623,895
Current maturities of notes payable	23,358,527	46,000,000		23,358,527
Total current debt outstanding, net	2,536,000,000	2,332,000,000		2,536,000,000
Long-term debt
Long-term power bonds	19,248,663,643	20,300,000,000	[1]	19,248,663,643
Long-term debt of variable interest entities	1,108,422,699	1,127,000,000		1,108,422,699
Long-term notes payable	0	23,000,000		0
Unamortized discounts, premiums, issues costs, and other	133,887,622	(143,000,000)		133,887,622
Total long-term debt, net	20,223,000,000	21,307,000,000		20,223,000,000
Total outstanding debt	22,759,000,000	23,639,000,000		$ 22,759,000,000
Net exchange gain from currency transactions	$ 167,000,000	$ 147,000,000
[1] Includes net exchange gain from currency transactions of $167 million and $147 million at June 30, 2019, and September 30, 2018, respec

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