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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022
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Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight® receivables, net (including current portion) | $ 59 | $ 62
Loans and other long-term receivables, net (including current portion) | 127 | 96
EnergyRight® financing obligations (including current portion) | 78 | 81
Membership interests of VIEs subject to mandatory redemption (including current portion) | 21 | 22
Long-term outstanding power bonds, net (including current maturities) | 18,971 | 18,070
Long-term debt of VIEs, net (including current maturities) | 988 | 989
Portion at Other than Fair Value Measurement [Member] |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight® receivables, net (including current portion) | 59 | 62
EnergyRight® financing obligations (including current portion) | 69 | 72
Membership interests of VIEs subject to mandatory redemption (including current portion) | 18 | 20
Long-term outstanding power bonds, net (including current maturities) |  | 17,856
Long-term debt of VIEs, net (including current maturities) | 18,883 | $ 1,007
Long-term notes payable (including current maturities) | $ 986 |

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