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Related Parties Related Parties (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Related Parties
Remaining appropriation investment	$ 258
Revenue from sales of electricity	10,503	$ 10,249	$ 11,318
Other income	(28)	0	21
Long-term Investments	4,053	3,198
Return on power program appropriation investment	(4)	(6)	(6)
Related Party Transactions
Related Parties
Revenue from sales of electricity	109	105	118
Other income	280	260	258
Operating expenses	214	224	222
Additions to property, plant, and equipment	10	9	10
Cash and cash equivalents	30	31	45
Receivables from Customers	65	94	76
Long-term Investments	573	485	279
Receivables, Long-term Contracts or Programs	31	27	53
Accounts payable and accrued liabilities	15	39	69
Long-term power bonds, net	1	1	0
Return on power program appropriation investment	$ (4)	$ (6)	$ (6)

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Amount payable to customer by broker-dealer.

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