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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue from sales of electricity	$ 2,899	$ 2,251	$ 2,521	$ 2,578	$ 3,239	$ 2,604	$ 2,750	$ 2,725	$ 10,249	$ 11,318	$ 11,233
Operating expenses	1,862	1,716	1,914	2,046	2,301	2,088	2,158	1,960	7,538	8,507	8,665
Operating income	1,037	535	607	532	938	516	592	765	2,711	2,811	2,568
Net income (loss)	$ 700	$ 205	$ 255	$ 192	$ 588	$ 165	$ 241	$ 423	$ 1,352	$ 1,417	$ 1,119

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

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