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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
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Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight® receivables, net (including current portion) | $ 56 | $ 56
Loans and other long-term receivables, net (including current portion) | 86 | 99
EnergyRight® financing obligations (including current portion) | 74 | 74
Membership interests of VIEs subject to mandatory redemption (including current portion) | 18 | 19
Long-term outstanding power bonds, net (including current maturities) | 18,356 | 19,416
Long-term debt of VIEs, net (including current maturities) | 1,694 | 966
Reported Value Measurement |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight® receivables, net (including current portion) | 56 | 56
Loans and other long-term receivables, net (including current portion) | 94 | 105
EnergyRight® financing obligations (including current portion) | 65 | 66
Membership interests of VIEs subject to mandatory redemption (including current portion) | 17 | 17
Long-term outstanding power bonds, net (including current maturities) | 18,857 | 18,889
Long-term debt of VIEs, net (including current maturities) | $ 1,721 | $ 934

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