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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2014
Accounting Policies [Abstract] |
Allowance for Uncollectible Accounts [Table Text Block] | The following table contains information about TVA’s current estimates related to uncollectible accounts.
Allowance for Uncollectible Accounts (in millions)
Description |  | Balance at beginning of year |  | Additions charged to expense |  | Deductions |  | Balance at end of year
For the year ended September 30, 2014 |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |
Receivables |  | $ | 1 |  |  | $ | 1 |  |  | $ | (1 | ) |  | $ | 1 |
Loans |  | 10 |  |  | — |  |  | (1 | ) |  | 9 |
Total allowances deducted from assets |  | $ | 11 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 10 |
For the year ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | $ | 7 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 1 |
Loans |  | 12 |  |  | — |  |  | (2 | ) |  | 10 |
Total allowances deducted from assets |  | $ | 19 |  |  | $ | — |  |  | $ | (8 | ) |  | $ | 11 |
For the year ended September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  |  |  |  |  |  |  |  |  |  |  |
Receivables |  | $ | 1 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 7 |
Loans |  | 11 |  |  | 1 |  |  | — |  |  | 12 |
Total allowances deducted from assets |  | $ | 12 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 19 |
Property, Plant, and Equipment Depreciation Rates | Average depreciation rates by asset class are as follows:
Property, Plant, and Equipment Depreciation Rates At September 30 (percent)
| 2014 |  | 2013 |  | 2012
Asset Class |
Nuclear | 2.90 |  |  | 2.86 |  |  | 2.71 |
Coal-Fired | 4.37 |  |  | 3.47 |  |  | 5.65 |
Hydroelectric | 1.44 |  |  | 1.30 |  |  | 1.35 |
Gas and oil-fired | 3.23 |  |  | 3.21 |  |  | 3.67 |
Transmission | 2.76 |  |  | 2.76 |  |  | 2.99 |
Other | 8.40 |  |  | 8.14 |  |  | 8.10 |

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- Definition Tabular disclosure of a rollforward of the activity in the allowance for accounts receivable and loans receivable. + References No definition available. + Details
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- Definition Tabular disclosure of average depreciation rates by asset class. + References No definition available. + Details
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- Details
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