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Benefit Plans Postretirement Benefit Costs Deferred as Regulatory Assets (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Defined Benefit Plan Disclosure |  |
Regulatory assets | $ 8,994 | $ 9,131
Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Unrecognized prior service cost (credit) | (180) | (203)
Unrecognized net loss | 4,337 | 4,113
Regulatory assets | 4,157 | 3,910
Other Post-retirement Benefits |  |
Defined Benefit Plan Disclosure |  |
Unrecognized prior service cost (credit) | (39) | (45)
Unrecognized net loss | 179 | 211
Regulatory assets | $ 140 | $ 166

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- Definition Amount deferred as regulatory asset of gains and losses that are not yet recognized as a component of net periodic benefit cost. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred amount in regulatory assets related to the cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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Period Type: | instant