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Jointly-Owned Electric Plants (Tables) | 12 Months Ended
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Dec. 31, 2017
Jointly-Owned Electric Plants [Abstract] |
Proportionate Ownership Interest In Jointly-Owned Facilities | NEE's and FPL's proportionate ownership interest in jointly-owned facilities is as follows:
| December 31, 2017
| Ownership Interest |  | Gross Investment(a) |  | Accumulated Depreciation(a) |  | Construction Work in Progress
|  |  | (millions)
FPL: |  |  |  |  |  |  |
St. Lucie Unit No. 2 | 85 | % |  | $ | 2,205 |  |  | $ | 863 |  |  | $ | 36 |
St. Johns River Power Park units (SJRPP) and coal terminal(b) | 20 | % |  | $ | 394 |  |  | $ | 215 |  |  | $ | — |
Scherer Unit No. 4 | 76 | % |  | $ | 1,146 |  |  | $ | 419 |  |  | $ | 24 |
NEER: |  |  |  |  |  |  |
Duane Arnold(c) | 70 | % |  | $ | 61 |  |  | $ | — |  |  | $ | 4 |
Seabrook | 88.23 | % |  | $ | 1,181 |  |  | $ | 302 |  |  | $ | 78 |
Wyman Station Unit No. 4 | 87.49 | % |  | $ | 26 |  |  | $ | 4 |  |  | $ | — |
Corporate and Other: |  |  |  |  |  |  |
Transmission substation assets located in Seabrook, New Hampshire | 88.23 | % |  | $ | 78 |  |  | $ | 14 |  |  | $ | 3 |
______________________
(a) | Excludes nuclear fuel.
(b) | SJRPP was shut down in January 2018. See Note 13 - Contracts.
(c) | Reflects impairment charge of $420 million pretax. See Note 4 - Nonrecurring Fair Value Measurements.

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- Definition Jointly-Owned Electric Plants [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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