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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue from sales of electricity	$ 3,239	$ 2,604	$ 2,750	$ 2,725	$ 3,185	$ 2,707	$ 2,792	$ 2,549	$ 11,318	$ 11,233	$ 10,739
Operating expenses	2,301	2,088	2,158	1,960	2,745	1,942	2,027	1,951	8,507	8,665	8,006
Operating income	938	516	592	765	440	765	765	598	2,811	2,568	2,733
Net income (loss)	$ 588	$ 165	$ 241	$ 423	$ (101)	$ 470	$ 462	$ 288	$ 1,417	$ 1,119	$ 685

X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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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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