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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Sep. 30, 2019
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
| 2019 |  | 2018
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 89 |  |  | $ | 73 |
Unrealized losses on commodity derivatives | 39 |  |  | 4 |
Environmental agreements | — |  |  | 3 |
Gallatin coal combustion residual facilities | — |  |  | 38 |
Environmental cleanup costs - Kingston ash spill | — |  |  | 266 |
Fuel cost adjustment receivable | 28 |  |  | 30 |
Total current regulatory assets | 156 |  |  | 414 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 4,756 |  |  | 3,119 |
Non-nuclear decommissioning costs | 1,741 |  |  | 1,019 |
Unrealized losses on interest rate derivatives | 1,241 |  |  | 692 |
Nuclear decommissioning costs | 868 |  |  | 784 |
Unrealized losses on commodity derivatives | 15 |  |  | 8 |
Environmental agreements | 12 |  |  | 11 |
Gallatin coal combustion residual facilities | — |  |  | 861 |
Other non-current regulatory assets | 130 |  |  | 118 |
Total non-current regulatory assets | 8,763 |  |  | 6,612 |
Total regulatory assets | $ | 8,919 |  |  | $ | 7,026 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 138 |  |  | $ | 146 |
Unrealized gains on commodity derivatives | 12 |  |  | 41 |
Total current regulatory liabilities | 150 |  |  | 187 |
Non-current regulatory liabilities |  |  |  |  |
Deferred other post-retirement benefits cost | — |  |  | 73 |
Unrealized gains on commodity derivatives | — |  |  | 31 |
Total non-current regulatory liabilities | — |  |  | 104 |
Total regulatory liabilities | $ | 150 |  |  | $ | 291 |

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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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