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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Debt Instrument |  |  |  |  |
Total long-term debt, net |  | $ 18,368 |  |  | $ 18,463
Redemptions and repurchases of power bonds |  | $ 28 | [1] | $ 1,860 |
Variable Interest Entity, Financial or Other Support, Type |  | 21 |  |  |
Total redemptions/maturities of debt | [1] | $ (49) |  |  |
2009 Series B June Payment |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions and repurchases of power bonds |  | 27 |  |  |
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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- Definition 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 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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