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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	$ 61	$ 62
Loans and other long-term receivables, net (including current portion)	110	96
EnergyRight® financing obligations (including current portion)	80	81
Membership interests of VIEs subject to mandatory redemption (including current portion)	21	22
Long-term outstanding power bonds, net (including current maturities)	19,383	18,070
Long-term debt of VIEs, net (including current maturities)	1,010	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)	61	62
EnergyRight® financing obligations (including current portion)	71	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)	18,894	$ 1,007
Long-term notes payable (including current maturities)	$ 986

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