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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Sep. 30, 2014
Aug. 09, 2013
Estimated Values of Financial Intruments Not Recorded at Fair Value      
EnergyRight receivables (including current portion) $ 163 $ 166  
Loans and other long-term receivables, net (including current portion) 99 81  
EnergyRight® financing obligation (including current portion) 209 215  
Unfunded Loan Commitments 20 18  
Membership interest of variable interest entity subject to mandatory redemption (including current portion) 47 50 $ 40
Long-term outstanding power bonds (including current maturities), net 25,134 26,889  
Long-term debt of variable interest entities (including current maturities) 1,392 1,425  
Carrying Value      
Estimated Values of Financial Intruments Not Recorded at Fair Value      
EnergyRight receivables (including current portion) 155 156  
Loans and other long-term receivables, net (including current portion) 111 92  
EnergyRight® financing obligation (including current portion) 186 190  
Unfunded Loan Commitments 0 0  
Membership interest of variable interest entity subject to mandatory redemption (including current portion) 38 39  
Long-term outstanding power bonds (including current maturities), net 21,776 22,980  
Long-term debt of variable interest entities (including current maturities) $ 1,296 $ 1,311