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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
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