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Related Parties Related Parties (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Related Parties
Long-term Investments	$ 4,968	$ 4,123
Return on power program appropriation investment	(7)	(6)	$ (4)
Related Party Transactions
Related Parties
Revenue from sales of electricity	118	120	134
Other income	273	282	296
Operating expenses	241	234	228
Additions to property, plant, and equipment	12	8	11
Cash and cash equivalents	31	31	30
Receivables from Customers	81	87	78
Long-term Investments	495	391	358
Receivables, Long-term Contracts or Programs	35	38	43
Accounts payable and accrued liabilities	45	42	42
Long-term power bonds, net	3	1	1
Return on power program appropriation investment	$ (7)	$ (6)	$ (4)

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