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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($)
Jun. 30, 2020
Sep. 30, 2019
Carrying Value    
Estimated Values of Financial Intruments Not Recorded at Fair Value    
EnergyRight® receivables (including current portion) $ 91,000,000 $ 101,000,000
Loans and other long-term receivables, net (including current portion) 134,000,000 131,000,000
EnergyRight® financing obligations (including current portion) 101,000,000 113,000,000
Unfunded loan commitments 0 0
Membership interests of VIEs subject to mandatory redemption (including current portion) 27,000,000 28,000,000
Long-term outstanding power bonds (including current maturities), net 19,849,000,000 20,124,000,000
Long-term debt of VIEs (including current maturities), net 1,109,000,000 1,128,000,000
Long-term notes payable (including current maturities) 0 23,000,000
EnergyRight® receivables (including current portion) 90,000,000 100,000,000
Loans and other long-term receivables, net (including current portion) 122,000,000 120,000,000
EnergyRight® financing obligations (including current portion) 112,000,000 126,000,000
Unfunded loan commitments 7,000,000 10,000,000
Membership interests of VIEs subject to mandatory redemption (including current portion) 38,000,000 37,000,000
Long-term outstanding power bonds (including current maturities), net 26,749,000,000 26,059,000,000
Long-term debt of VIEs (including current maturities), net 1,437,000,000 1,371,000,000
Long-term notes payable (including current maturities) $ 0 $ 23,000,000