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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Dec. 31, 2016
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, 2016 |  | At September 30, 2016
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 237 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 104 |  |  | 122 |
Fuel cost adjustment receivable | 41 |  |  | 98 |
Environmental agreements | 27 |  |  | 34 |
Environmental cleanup costs - Kingston ash spill | 42 |  |  | 42 |
Other current regulatory assets | 3 |  |  | 3 |
Total current regulatory assets | 454 |  |  | 536 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,330 |  |  | 5,385 |
Unrealized losses on interest rate derivatives | 1,106 |  |  | 1,547 |
Nuclear decommissioning costs | 935 |  |  | 938 |
Deferred nuclear generating units | 915 |  |  | 850 |
Non-nuclear decommissioning costs | 863 |  |  | 819 |
Environmental cleanup costs - Kingston ash spill | 288 |  |  | 299 |
Unrealized losses on commodity derivatives | 32 |  |  | 56 |
Environmental agreements | 15 |  |  | 18 |
Other non-current regulatory assets | 244 |  |  | 252 |
Total non-current regulatory assets | 9,728 |  |  | 10,164 |
Total regulatory assets | $ | 10,182 |  |  | $ | 10,700 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 151 |  |  | $ | 148 |
Unrealized gains on commodity derivatives | 22 |  |  | 6 |
Total current regulatory liabilities | 173 |  |  | 154 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 6 |  |  | 3 |
Total non-current regulatory liabilities | 6 |  |  | 3 |
Total regulatory liabilities | $ | 179 |  |  | $ | 157 |

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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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