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Revenue Customer Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Other Significant Noncash Transaction, Value of Consideration Given			$ 10	$ 75	$ 100
Revenue Capitalized During Pre-Commercial Operations	$ 0	$ (1)	0	(11)
Sales of Electricity	2,565	2,669	7,958	7,931
Electric revenue	2,563	2,667	7,955	7,936
Other revenue	39	38	121	117
Revenues	2,604	2,707	8,079	8,048
lpcs [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	2,366	2,464	7,347	7,344
industries directly served [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	168	172	521	506
federal agencies and other [Domain]
Revenue, Major Customer [Line Items]
Electric revenue	$ 31	$ 33	$ 90	$ 92

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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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