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Summary of Significant Accounting Policies General and Basis of Presentation (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 People variable_interest_entities | Mar. 31, 2014 | Mar. 31, 2015 People variable_interest_entities | Mar. 31, 2014 | Sep. 30, 2014
General and Basis of Presentation |  |  |  |  |
Population of TVA's service area | 9,000,000 tve_PopulationOfServiceArea |  | 9,000,000 tve_PopulationOfServiceArea |  |
Amount of appropriation investment that must be repaid |  |  |  |  | $ 1,000,000,000 tve_AmountOfAppropriationInvestmentThatMustBeRepaid
Number of variable interest entities | 3 tve_NumberOfVariableInterestEntities |  | 3 tve_NumberOfVariableInterestEntities |  |
Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net |  |  | 34,000,000 tve_ReclassificationfromEnvironmentalcleanupcostsKingstonashspillnoncashtoOthernet |  |
Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net |  |  | (43,000,000)tve_ReclassificationfromEnvironmentalcleanupcostsKingstonashspilltoOthernet |  |
Reclassification to Other, net from Environmental cleanup costs-Kingston ash spill-non cash and Environmental cleanup costs-Kingston ash spill |  |  | (9,000,000)tve_ReclassificationtoOthernetfromEnvironmentalcleanupcostsKingstonashspillnoncashandEnvironmentalcleanupcostsKingstonashspill |  |
Period of time for customers to fulfill payment arrangements |  |  | 90 days |  |
Allowance for uncollectible accounts, accounts receivable | 1,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  | 1,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  | 1,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Loans receivable | 110,000,000 us-gaap_NotesReceivableNet |  | 110,000,000 us-gaap_NotesReceivableNet |  | 81,000,000 us-gaap_NotesReceivableNet
Loans receivable, allowance | 8,000,000 us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent |  | 8,000,000 us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent |  | 9,000,000 us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent
Depreciation expense | 383,000,000 us-gaap_Depreciation | 382,000,000 us-gaap_Depreciation | 763,000,000 us-gaap_Depreciation | 750,000,000 us-gaap_Depreciation |
Total possible amount of payments | 162,000,000 tve_TotalpossibleamountofBLEUpayments |  | 162,000,000 tve_TotalpossibleamountofBLEUpayments |  |
Payments attributable to BLEU fuel program | 101,000,000 tve_PaymentsattributabletoBLEUfuelprogram |  | 101,000,000 tve_PaymentsattributabletoBLEUfuelprogram |  |
BLEU fuel obligation | $ 39,000,000 tve_BLEUfuelobligation |  | $ 39,000,000 tve_BLEUfuelobligation |  |

X
- Definition The amount of the appropriation investment from Congress that must be repaid. + References No definition available. + Details
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X
- Definition The liability established for payments due that are attributable to blended low-enriched uranium fuel that has been used. + References No definition available. + Details
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X
- Definition Number of variable interest entities in which TVA is the primary beneficiary. + References No definition available. + Details
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- Definition Payments attributable to blended low-enriched uranium fuel program + References No definition available. + Details
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- Definition Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net on the Consolidated Statements of Cash Flows + References No definition available. + Details
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- Definition Total of past and projected future payments that TVA may make to the DOE over the duration of the BLEU fuel program, from inception to termination. It includes the amounts paid out, plus an estimated amount related to possible future payments that may be payable to the DOE until the time that the BLEU fuel program ceases to be in effect. + References No definition available. + Details
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