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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenue from sales of electricity	$ 10,503	$ 10,249	$ 11,318
Operating expenses	7,658	7,538	8,507
Operating income	2,845	2,711	2,811
Net income (loss)	$ 1,512	$ 1,352	$ 1,417

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