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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Sep. 30, 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 September 30
| 2013 |  | 2012
Current regulatory assets |  |  |
Unrealized losses on commodity derivatives | $ | 183 |  |  | $ | 310 |
Deferred nuclear generating units | 237 |  |  | 237 |
Environmental agreements | 73 |  |  | 87 |
Fuel cost adjustment receivable | — |  |  | 68 |
Environmental cleanup costs – Kingston ash spill | 68 |  |  | 72 |
Total current regulatory assets | 561 |  |  | 774 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 4,076 |  |  | 5,517 |
Unrealized losses on interest rate derivatives | 808 |  |  | 1,332 |
Nuclear decommissioning costs | 893 |  |  | 914 |
Environmental cleanup costs - Kingston ash spill | 681 |  |  | 797 |
Construction costs | — |  |  | 619 |
Non-nuclear decommissioning costs | 571 |  |  | 550 |
Deferred nuclear generating units | 1,438 |  |  | 473 |
Unrealized losses on commodity derivatives | 139 |  |  | 335 |
Environmental agreements | 189 |  |  | 237 |
Other non-current regulatory assets | 336 |  |  | 353 |
Total non-current regulatory assets | 9,131 |  |  | 11,127 |
Total regulatory assets | $ | 9,692 |  |  | $ | 11,901 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 176 |  |  | $ | 173 |
Fuel cost adjustment liability | 29 |  |  | — |
Unrealized gains on commodity derivatives | 7 |  |  | 18 |
Total current regulatory liabilities | 212 |  |  | 191 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 1 |  |  | 109 |
Total non-current regulatory liabilities | 1 |  |  | 109 |
Total regulatory liabilities | $ | 213 |  |  | $ | 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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