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Revenue Customer Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Other Significant Noncash Transaction, Value of Consideration Given			$ 10	$ 50	$ 100
Revenue Capitalized During Pre-Commercial Operations	$ 0	$ (10)	0	(11)
Sales of Electricity	2,712	2,753	5,393	5,262
Electric revenue	2,712	2,761	5,392	5,269
Other revenue	38	39	82	79
Revenues	2,750	2,792	5,475	5,341
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,514	2,564	4,981	4,880
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	168	168	353	333
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	$ 30	$ 31	$ 59	$ 60

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Revenue from sales of electricity

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Other revenue

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- Definition

Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount

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Sales of Electricity

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The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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