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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Dec. 31, 2018
Revenue from External Customer [Line Items] |
Revenue from External Customers by Products and Services [Table Text Block] |
Operating Revenues by Customer Type Three Months Ended December 31 (in millions)
| 2018 |  | 2017
Revenue from sales of electricity |  |  |
Local power companies | $ | 2,468 |  |  | $ | 2,316 |
Industries directly served | 184 |  |  | 165 |
Federal agencies and other | 29 |  |  | 29 |
Revenue capitalized during pre-commercial plant operations(1) | — |  |  | (1 | )
Revenue from sales of electricity | 2,681 |  |  | 2,509 |
Other revenues | 44 |  |  | 40 |
Total operating revenues | $ | 2,725 |  |  | $ | 2,549 |
Regulatory Assets and Liabilities | Components of regulatory assets and regulatory liabilities are summarized in the table below.
Regulatory Assets and Liabilities
| At December 31, 2018 |  | At September 30, 2018
Current regulatory assets |  |  |
Gallatin coal combustion residual facilities | $ | 29 |  |  | $ | 38 |
Unrealized losses on interest rate derivatives | 75 |  |  | 73 |
Environmental agreements | 1 |  |  | 3 |
Unrealized losses on commodity contracts | 5 |  |  | 4 |
Environmental cleanup costs – Kingston ash spill | 195 |  |  | 266 |
Fuel cost adjustment receivable | 75 |  |  | 30 |
Total current regulatory assets | 380 |  |  | 414 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 3,059 |  |  | 3,119 |
Non-nuclear decommissioning costs | 1,086 |  |  | 1,019 |
Nuclear decommissioning costs | 1,006 |  |  | 784 |
Gallatin coal combustion residual facilities | 866 |  |  | 861 |
Unrealized losses on interest rate derivatives | 800 |  |  | 692 |
Environmental agreements | 12 |  |  | 11 |
Unrealized losses on commodity contracts | 5 |  |  | 8 |
Other non-current regulatory assets | 128 |  |  | 118 |
Total non-current regulatory assets | 6,962 |  |  | 6,612 |
Total regulatory assets | $ | 7,342 |  |  | $ | 7,026 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 144 |  |  | $ | 146 |
Unrealized gains on commodity derivatives | 50 |  |  | 41 |
Total current regulatory liabilities | 194 |  |  | 187 |
Non-current regulatory liabilities |  |  |  |  |
Deferred other post-retirement benefits cost | 68 |  |  | 73 |
Unrealized gains on commodity derivatives | 27 |  |  | 31 |
Total non-current regulatory liabilities | 95 |  |  | 104 |
Total regulatory liabilities | $ | 289 |  |  | $ | 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599 + Details
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