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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Debt Instrument
Total long-term debt, net		$ 18,833		$ 18,794
Redemptions and repurchases of power bonds		1	$ 1
Total redemptions/maturities of debt	[1]	(1)
2009 Series B [Member]
Debt Instrument
Redemptions and repurchases of power bonds		$ 1
[1] (1) All redemptions were at 100 percent of par.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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