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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Sep. 30, 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 September 30
| 2016 |  | 2015
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 237 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 122 |  |  | 162 |
Environmental agreements | 34 |  |  | 47 |
Environmental cleanup costs – Kingston ash spill | 42 |  |  | 43 |
Fuel cost adjustment receivable | 98 |  |  | 15 |
Other current regulatory assets | 3 |  |  | 2 |
Total current regulatory assets | 536 |  |  | 506 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,385 |  |  | 5,565 |
Unrealized losses on interest rate derivatives | 1,547 |  |  | 1,236 |
Nuclear decommissioning costs | 938 |  |  | 1,003 |
Environmental cleanup costs - Kingston ash spill | 299 |  |  | 348 |
Non-nuclear decommissioning costs | 819 |  |  | 828 |
Deferred nuclear generating units | 850 |  |  | 1,042 |
Environmental agreements | 18 |  |  | 55 |
Unrealized losses on commodity derivatives | 56 |  |  | 63 |
Other non-current regulatory assets | 252 |  |  | 278 |
Total non-current regulatory assets | 10,164 |  |  | 10,418 |
Total regulatory assets | $ | 10,700 |  |  | $ | 10,924 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 148 |  |  | $ | 164 |
Unrealized gains on commodity derivatives | 6 |  |  | — |
Total current regulatory liabilities | 154 |  |  | 164 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 3 |  |  | 2 |
Total non-current regulatory liabilities | 3 |  |  | 2 |
Total regulatory liabilities | $ | 157 |  |  | $ | 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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