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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Debt Instrument
Total long-term debt, net		$ 18,467		$ 18,463
Redemptions and repurchases of power bonds		1	$ 1
Total redemptions/maturities of debt	[1]	$ (1)
Total
Debt Instrument
Percent of par value		10000.00%
2009 Series B [Member]
Debt Instrument
Redemptions and repurchases of power bonds		$ 1
2009 Series B [Member]
Debt Instrument
Debt Instrument, Interest Rate, Effective Percentage		3.77%
[1] (1) All redemptions were at 100 percent of par.

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The percent of par value that debt was issued/redeemed for.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of cash inflow (outflow) for debt classified as other.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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