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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | ---
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight receivables | $ 152 | $ 150
Loans and other long-term receivables, net | 80 | 76
EnergyRight purchase obligaiton | 187 | 185
Long-term power bonds (including current maturities), net | 23,546 | 22,577
Long-term debt of variable interest entities (including current maturities), net | 994 | 994
Fair Value |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight receivables | 152 | 150
Loans and other long-term receivables, net | 73 | 70
EnergyRight purchase obligaiton | 215 | 209
Long-term power bonds (including current maturities), net | 28,990 | 28,041
Long-term debt of variable interest entities (including current maturities), net | $ 1,122 | $ 1,116

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- Definition The aggregate of amounts due from customers or clients more than one year from the balance sheet date (including current maturities), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date more than one year from the balance sheet date, reduced to their estimated net realizable fair value by an allowance established by the Company of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + References No definition available. + Details
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- Definition A purchase obligation including current and non-current portions. + References No definition available. + Details
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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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