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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

X

- 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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X

- Definition

Long-term debt of variable interest entities including current maturities

+ References

No definition available.

+ Details

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Namespace Prefix:	tve_
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X

- Definition

A purchase obligation including current and non-current portions.

+ References

No definition available.

+ Details

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- Details

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X

- 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

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X

- 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

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