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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
Revenue from sales of electricity	$ 12,540	$ 10,503	$ 10,249
Operating expenses	10,129	7,658	7,538
Operating income	2,411	2,845	2,711
Net income (loss)	$ 1,108	$ 1,512	$ 1,352

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