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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Oct. 02, 2024	Sep. 30, 2024
Debt Instrument
Total long-term debt, net		$ 18,160			$ 18,764
Repayments of Unsecured Debt		1	$ 1
Amount of letters of credit outstanding		$ 6
Percent of par value	[1]	100.00%
Long-term power bonds, net		$ 16,485			$ 17,867
Debt Instrument, Redemption, Description		1
Proceeds from Issuance of Debt		$ 800	$ 0
Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument
Debt and Lease Obligation				$ 800
2009 series B
Debt Instrument
Repayments of Unsecured Debt		$ 1
[1] (1) All redemptions were at 100 percent of par.

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