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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight receivables | $ 149 | $ 150
Long-term Investments and Receivables, Net | 84 | 76
EnergyRight purchase obligaiton | 184 | 185
Long-term power bonds (including current maturities), net | 22,186 | 22,577
Long-term debt of variable interest entities (including current maturities), net | 988 | 994
Fair Value |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight receivables | 149 | 150
Long-term Investments and Receivables, Net | 78 | 70
EnergyRight purchase obligaiton | 208 | 209
Long-term power bonds (including current maturities), net | 24,514 | 28,041
Long-term debt of variable interest entities (including current maturities), net | $ 1,033 | $ 1,116

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