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Regulatory Assets and Liabilities (Tables) | 6 Months Ended
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Mar. 31, 2013
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Components of regulatory assets and regulatory liabilities are summarized in the table below.
Regulatory Assets and Liabilities
| At March 31, 2013 |  | At September 30, 2012
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 236 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 174 |  |  | 310 |
Environmental agreements | 89 |  |  | 87 |
Environmental cleanup costs - Kingston ash spill | 72 |  |  | 72 |
Fuel cost adjustment receivable | 13 |  |  | 68 |
Total current regulatory assets | 584 |  |  | 774 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,331 |  |  | 5,517 |
Unrealized losses on interest rate derivatives | 1,119 |  |  | 1,332 |
Nuclear decommissioning costs | 890 |  |  | 914 |
Environmental cleanup costs - Kingston ash spill | 756 |  |  | 797 |
Construction costs | 619 |  |  | 619 |
Non-nuclear decommissioning costs | 556 |  |  | 550 |
Deferred nuclear generating units | 354 |  |  | 473 |
Environmental agreements | 226 |  |  | 237 |
Unrealized losses on commodity derivatives | 157 |  |  | 335 |
Other non-current regulatory assets | 344 |  |  | 353 |
Total non-current regulatory assets | 10,352 |  |  | 11,127 |
Total regulatory assets | $ | 10,936 |  |  | $ | 11,901 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 177 |  |  | $ | 173 |
Unrealized gains on commodity derivatives | 11 |  |  | 18 |
Total current regulatory liabilities | 188 |  |  | 191 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 3 |  |  | 109 |
Total non-current regulatory liabilities | 3 |  |  | 109 |
Total regulatory liabilities | $ | 191 |  |  | $ | 300 |

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- Definition Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet or that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Regulatory liabilities can result from obligations to make refunds to customers or deferral of gains that will be credited to customers in future periods + References No definition available. + Details
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