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Regulatory Assets and Liabilities (Tables) | 9 Months Ended
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Jun. 30, 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 June 30, 2015 |  | At September 30, 2014
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 236 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 182 |  |  | 134 |
Environmental agreements | 70 |  |  | 54 |
Environmental cleanup costs - Kingston ash spill | 45 |  |  | 47 |
Fuel cost adjustment receivable | 14 |  |  | 9 |
Other current regulatory assets | 2 |  |  | — |
Total current regulatory assets | 549 |  |  | 481 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 4,087 |  |  | 4,297 |
Deferred pension costs due to actions of regulator | 171 |  |  | — |
Unrealized losses on interest rate derivatives | 1,028 |  |  | 957 |
Nuclear decommissioning costs | 892 |  |  | 931 |
Environmental cleanup costs - Kingston ash spill | 362 |  |  | 421 |
Non-nuclear decommissioning costs | 720 |  |  | 645 |
Deferred nuclear generating units | 1,097 |  |  | 1,255 |
Environmental agreements | 63 |  |  | 108 |
Unrealized losses on commodity derivatives | 81 |  |  | 72 |
Other non-current regulatory assets | 286 |  |  | 308 |
Total non-current regulatory assets | 8,787 |  |  | 8,994 |
Total regulatory assets | $ | 9,336 |  |  | $ | 9,475 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 165 |  |  | $ | 182 |
Unrealized gains on commodity derivatives | 3 |  |  | 2 |
Total current regulatory liabilities | 168 |  |  | 184 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 1 |  |  | — |
Total non-current regulatory liabilities | 1 |  |  | — |
Total regulatory liabilities | $ | 169 |  |  | $ | 184 |

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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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