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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, 2014 | Sep. 30, 2013 | Aug. 09, 2013
--- | --- | --- | ---
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |  |
EnergyRight receivables | $ 152 | $ 150 |
Notes, Loans and Financing Receivable, Net, Noncurrent | 96 | 67 |
EnergyRight purchase obligaiton | 204 | 210 |
Membership interest of variable interest entity subject to mandatory redemption (including current portion) | 50 | 50 | 40
Long-term power bonds (including current maturities), net | 25,603 | 24,603 |
Long-term debt of variable interest entities (including current maturities), net | 1,441 | 1,386 |
Carrying Value |  |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |  |
EnergyRight receivables | 152 | 150 |
Notes, Loans and Financing Receivable, Net, Noncurrent | 105 | 73 |
EnergyRight purchase obligaiton | 187 | 186 |
Membership interest of variable interest entity subject to mandatory redemption (including current portion) | 39 | 40 |
Long-term power bonds (including current maturities), net | 22,044 | 22,347 |
Long-term debt of variable interest entities (including current maturities), net | $ 1,326 | $ 1,341 |

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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + 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 210.5-02.17) -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 17 -Article 5 + 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 Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
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