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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Sep. 30, 2018	Mar. 31, 2019
Debt Instrument
Foreign Currency Transactions, Description			146
Short-term debt
Short-term debt, net		$ 1,216	$ 1,617
Current maturities of power bonds		1,032	1,032
Current maturities of long-term debt of variable interest entities		38	38
Current maturities of notes payable		46	26
Total current debt outstanding, net		2,332	2,713
Long-term debt
Long-term power bonds	[1]	20,300	19,298
Long-term debt of variable interest entities		1,127	1,108
Long-term notes payable		23	22
Unamortized discounts, premiums, issues costs, and other		(143)	(137)
Total long-term debt, net		21,307	20,291
Total outstanding debt		23,639	$ 23,004
Net exchange gain from currency transactions		$ 147
[1] Includes net exchange gain from currency transactions of $146 million and $147 million at March 31, 2019, and September 30, 2018, respectively.

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