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Summary of Significant Accounting Policies General and Basis of Presentation (Details) People in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) variable_interest_entities | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 | Dec. 31, 2016 People | Dec. 31, 2016 USD ($) | Dec. 31, 2016 Sites
General and Basis of Presentation |  |  |  |  |  |  |
Population of TVA's service area | People |  |  |  |  | 9 |  |
Number of wholly-owned direct subsidiaries |  |  |  | 2 |  |  |
Number of variable interest entities | variable_interest_entities | 3 |  |  |  |  |  |
Allowance for uncollectible accounts, accounts receivable |  |  | $ 1,000,000 |  |  | $ 1,000,000 |
Loans receivable, carrying value |  |  | 130,000,000 |  |  | 142,000,000 |
Allowance for loans receivable |  |  | 8,000,000 |  |  | 8,000,000 |
Revenue capitalized during pre-commercial operations | $ 14,000,000 |  |  |  |  |  |
Number of construction projects |  |  |  | 2 |  |  | 1
Fuel cost capitalized during pre-commercial operations | 5,000,000 |  |  |  |  |  |
Depreciation expense | $ 336,000,000 | $ 364,000,000 |  |  |  |  |
Change in depreciation due to new study | 56 |  |  |  |  |  |
AFUDC minimum total project cost |  |  | $ 1,000,000,000 |  |  |  |
AFUDC capitalized | $ 0 | $ 58,000,000 |  |  |  |  |
Total estimated amount of BLEU payments |  |  |  |  |  | 165,000,000 |
Payments attributable to BLEU fuel program |  |  |  |  |  | 151,000,000 |
BLEU fuel obligation |  |  |  |  |  | $ 14,000,000 |

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- Definition Number of variable interest entities in which TVA is the primary beneficiary. + References No definition available. + Details
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- Definition Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount + 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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