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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2013
Estimated Values of Financial Intruments Not Recorded at Fair Value      
EnergyRight receivables (including current portion) $ 156 $ 162  
Loans and other long-term receivables, net (including current portion) 144 117  
EnergyRight® financing obligation (including current portion) 198 208  
Unfunded Loan Commitments 16 9  
Membership interest of variable interest entity subject to mandatory redemption (including current portion) 47 47 $ 40
Long-term outstanding power bonds (including current maturities), net 27,375 25,468  
Long-term debt of variable interest entities (including current maturities), net 1,444 1,407  
Carrying Value      
Estimated Values of Financial Intruments Not Recorded at Fair Value      
EnergyRight receivables (including current portion) 151 156  
Loans and other long-term receivables, net (including current portion) 156 129  
EnergyRight® financing obligation (including current portion) 176 185  
Unfunded Loan Commitments 0 0  
Membership interest of variable interest entity subject to mandatory redemption (including current portion) 36 37  
Long-term outstanding power bonds (including current maturities), net 22,603 22,649  
Long-term debt of variable interest entities (including current maturities), net $ 1,250 $ 1,266