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Fair Value Measurements Fair Value Measurements - Estimated Values of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Aug. 09, 2013
Estimated Values of Financial Instruments (Level 2 Valuation)      
EnergyRight receivables (including current portion) $ 144 $ 162  
Loans and other long-term receivables, net (including current portion) 130 117  
EnergyRight purchase obligation (including current portion) 183 208  
Unfunded Loan Commitments 17 9  
Membership interests of VIE subject to mandatory redemption (including current portion) 46 47 $ 40
Long-term outstanding power bonds (including current maturities), net 28,620 25,468  
Long-term debt of variable interest entities (including current maturities) 1,468 1,407  
Long-term notes payable (including current maturities) 75 0  
Portion at Other than Fair Value Measurement      
Estimated Values of Financial Instruments (Level 2 Valuation)      
EnergyRight receivables (including current portion) 141 156  
Loans and other long-term receivables, net (including current portion) 141 129  
EnergyRight purchase obligation (including current portion) 163 185  
Unfunded Loan Commitments 0 0  
Membership interests of VIE subject to mandatory redemption (including current portion)   37  
Long-term outstanding power bonds (including current maturities), net 22,456 22,649  
Long-term debt of variable interest entities (including current maturities) 1,234 1,266  
Long-term notes payable (including current maturities) $ 75 $ 0