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Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023		Mar. 31, 2022	Sep. 30, 2022
Subsequent Event [Line Items]
Redemptions and repurchases of power bonds			$ 1	[1]	$ 1
Current regulatory assets	$ 328		328			$ 138
Operating and maintenance	823	$ 767	1,650		1,547
Interest expense	268	$ 264	530		$ 527
Non-current regulatory assets	5,820		5,820			6,134
Regulatory Liability, Noncurrent	68		68			172
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Regulatory Liability, Noncurrent	6		6			102
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Current regulatory assets	249		249			14
Non-current regulatory assets	$ 46		$ 46			$ 1
[1] (1) The 2023 Series A Bonds were issued at 99.187 percent of par. (2) All redemptions were at 100 percent of par.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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