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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Sep. 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 September 30
| 2015 |  | 2014
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 237 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 162 |  |  | 134 |
Environmental agreements | 47 |  |  | 54 |
Environmental cleanup costs – Kingston ash spill | 43 |  |  | 47 |
Fuel cost adjustment receivable | 15 |  |  | 9 |
Other current regulatory assets | 2 |  |  | — |
Total current regulatory assets | 506 |  |  | 481 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,565 |  |  | 4,297 |
Unrealized losses on interest rate derivatives | 1,236 |  |  | 957 |
Nuclear decommissioning costs | 1,003 |  |  | 931 |
Environmental cleanup costs - Kingston ash spill | 348 |  |  | 421 |
Non-nuclear decommissioning costs | 828 |  |  | 645 |
Deferred nuclear generating units | 1,042 |  |  | 1,255 |
Environmental agreements | 55 |  |  | 108 |
Unrealized losses on commodity derivatives | 63 |  |  | 72 |
Other non-current regulatory assets | 278 |  |  | 308 |
Total non-current regulatory assets | 10,418 |  |  | 8,994 |
Total regulatory assets | $ | 10,924 |  |  | $ | 9,475 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 164 |  |  | $ | 182 |
Unrealized gains on commodity derivatives | — |  |  | 2 |
Total current regulatory liabilities | 164 |  |  | 184 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 2 |  |  | — |
Total non-current regulatory liabilities | 2 |  |  | — |
Total regulatory liabilities | $ | 166 |  |  | $ | 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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