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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, 2013 | Sep. 30, 2013 | Aug. 09, 2013
--- | --- | --- | ---
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |  |
EnergyRight receivables | $ 151 | $ 150 |
Long-term Investments and Receivables, Net | 79 | 73 |
EnergyRight purchase obligaiton | 186 | 186 |
Membership interest of variable interest entity subject to mandatory redemption (including current portion) | 40 | 40 | 40
Long-term power bonds (including current maturities), net | 22,364 | 22,347 |
Long-term debt of variable interest entities (including current maturities), net | 1,341 | 1,341 |
Fair Value |  |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |  |
EnergyRight receivables | 151 | 150 |
Long-term Investments and Receivables, Net | 71 | 67 |
EnergyRight purchase obligaiton | 205 | 210 |
Membership interest of variable interest entity subject to mandatory redemption (including current portion) | 50 | 50 |
Long-term power bonds (including current maturities), net | 22,983 | 24,603 |
Long-term debt of variable interest entities (including current maturities), net | $ 1,381 | $ 1,386 |

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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle) and amount due to the Entity from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such investments and receivables to an amount that approximates their net realizable value. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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