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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Dec. 31, 2015
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 December 31, 2015 |  | At September 30, 2015
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 237 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 169 |  |  | 162 |
Environmental agreements | 49 |  |  | 47 |
Environmental cleanup costs - Kingston ash spill | 43 |  |  | 43 |
Fuel cost adjustment receivable | 3 |  |  | 15 |
Other current regulatory assets | 2 |  |  | 2 |
Total current regulatory assets | 503 |  |  | 506 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,556 |  |  | 5,565 |
Unrealized losses on interest rate derivatives | 1,147 |  |  | 1,236 |
Nuclear decommissioning costs | 970 |  |  | 1,003 |
Environmental cleanup costs - Kingston ash spill | 331 |  |  | 348 |
Non-nuclear decommissioning costs | 835 |  |  | 828 |
Deferred nuclear generating units | 1,004 |  |  | 1,042 |
Environmental agreements | 41 |  |  | 55 |
Unrealized losses on commodity derivatives | 81 |  |  | 63 |
Other non-current regulatory assets | 272 |  |  | 278 |
Total non-current regulatory assets | 10,237 |  |  | 10,418 |
Total regulatory assets | $ | 10,740 |  |  | $ | 10,924 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 157 |  |  | $ | 164 |
Fuel cost adjustment payable | 25 |  |  | — |
Total current regulatory liabilities | 182 |  |  | 164 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 4 |  |  | 2 |
Total non-current regulatory liabilities | 4 |  |  | 2 |
Total regulatory liabilities | $ | 186 |  |  | $ | 166 |

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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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