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Fair Value Measurements Investments Gains (Losses) (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Investment Gains (Losses)
Securities classified as trading and measured at fair value	$ 2,000,000,000us-gaap_TradingSecurities
NDT unfunded commitments related to private partnerships	107,000,000us-gaap_CommitmentsFairValueDisclosure
SERP
Investment Gains (Losses)
Unrealized gains (losses) on investments	(1,000,000)us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_SerpMember	1,000,000us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_SerpMember
LTDCP [Member]
Investment Gains (Losses)
Unrealized gains (losses) on investments	(1,000,000)us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_LTDCPMember	0us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_LTDCPMember
NDT
Investment Gains (Losses)
Unrealized gains (losses) on investments	23,000,000us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_NdtMember	30,000,000us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_NdtMember
ART
Investment Gains (Losses)
Unrealized gains (losses) on investments	6,000,000us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_ArtMember	15,000,000us-gaap_UnrealizedGainLossOnInvestments / invest_InvestmentAxis = tve_ArtMember
Maximum
Investment Gains (Losses)
Equity investments not required to be measured at fair value	$ 1,000,000us-gaap_EquityMethodInvestments / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ 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 210.5-02.25)

-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 25

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 9

+ Details

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Balance Type:	credit
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X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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X

- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Period Type:	instant

X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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