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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Mar. 31, 2022	Mar. 31, 2022		Mar. 31, 2021	Sep. 30, 2021
Debt Instrument
Total long-term debt, net		$ 18,432	$ 18,432			$ 18,463
Redemptions and repurchases of power bonds			$ 1	[1]	$ 1,501
Variable Interest Entity, Financial or Other Support, Type			21
Total redemptions/maturities of debt	[1]		$ (22)
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 after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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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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Description of the type of financial or other support (for example, liquidity arrangements and obligations to purchase assets) provided by the reporting entity to the Variable Interest Entity (VIE) which the reporting entity was not previously contractually required to provide or that it intends to provide.

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-SubTopic 10
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