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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Quarterly Financial Information Disclosure [Abstract]
Revenue from sales of electricity	$ 12,054	$ 12,540	$ 10,503
Operating expenses	10,360	10,129	7,658
Operating income	1,694	2,411	2,845
Net income (loss)	$ 500	$ 1,108	$ 1,512

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