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Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Nov. 14, 2016
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | $ 454 | $ 536 |
Non-current regulatory assets | 9,728 | 10,164 |
Regulatory assets | 10,182 | 10,700 |
Current regulatory liabilities | 173 | 154 |
Non-current regulatory liabilities | 6 | 3 |
Regulatory liabilities | 179 | 157 |
Bellefonte site contract to sell |  |  | $ 111
Net book value and related ARO's of Bellefonte assets | 121 |  |
Amount received on Bellefonte contract to sell | 22 |  |
Amount to receive on Bellefonte contract to sell at closing | $ 89 |  |
Max number of years buyer had to close | 2 years |  |
Yearly amortization of Deferred nuclear generating units |  | 0 |
Fuel cost adjustment tax equivalents |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory liabilities | $ 151 | 148 |
Unrealized gains/losses on commodity derivatives |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory liabilities | 22 | 6 |
Non-current regulatory liabilities | 6 | 3 |
Deferred nuclear generating units |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | 237 | 237 |
Non-current regulatory assets | 915 | 850 |
Unrealized gains/losses on commodity derivatives |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | 104 | 122 |
Non-current regulatory assets | 32 | 56 |
Fuel cost adjustment receivable/liability |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | 41 | 98 |
Environmental agreements |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | 27 | 34 |
Non-current regulatory assets | 15 | 18 |
Environmental cleanup costs - Kingston ash spill |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | 42 | 42 |
Non-current regulatory assets | 288 | 299 |
Other current regulatory assets |  |  |
Regulatory Assets and Liabilities |  |  |
Current regulatory assets | 3 | 3 |
Deferred pension costs and other post-retirement benefits costs |  |  |
Regulatory Assets and Liabilities |  |  |
Non-current regulatory assets | 5,330 | 5,385 |
Unrealized losses on interest rate derivatives |  |  |
Regulatory Assets and Liabilities |  |  |
Non-current regulatory assets | 1,106 | 1,547 |
Nuclear decommissioning costs |  |  |
Regulatory Assets and Liabilities |  |  |
Non-current regulatory assets | 935 | 938 |
Non-nuclear decommissioning costs |  |  |
Regulatory Assets and Liabilities |  |  |
Non-current regulatory assets | 863 | 819 |
Other non-current regulatory assets |  |  |
Regulatory Assets and Liabilities |  |  |
Non-current regulatory assets | $ 244 | $ 252 |

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- Definition Amount of cash inflow for the sale of long-lived, physical assets used to produce goods and services and not intended for resale, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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