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Jointly-Owned Electric Plants (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
FPL[Member] | Jointly Owned Nuclear Power Plant 1 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 85.00% |
Facility Name | St. Lucie Unit No. 2 |
Gross Investment | $ 2,226 |
Accumulated Depreciation | 972 |
Construction Work in Progress | $ 66 |
FPL[Member] | Jointly Owned Electricity Generation Plant 1 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 76.00% |
Facility Name | Scherer Unit No. 4 |
Gross Investment | $ 1,227 |
Accumulated Depreciation | 473 |
Construction Work in Progress | $ 55 |
Gulf Power [Member] | Jointly Owned Electricity Generation Plant 4 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |
Facility Name | Daniel Units No. 1 and No. 2 |
Gross Investment | $ 715 |
Accumulated Depreciation | 222 |
Construction Work in Progress | $ 22 |
Gulf Power [Member] | Jointly Owned Electricity Generation Plant 5 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 25.00% |
Facility Name | Scherer Unit No. 3 |
Gross Investment | $ 423 |
Accumulated Depreciation | 146 |
Construction Work in Progress | $ 14 |
NEER [Member] | Jointly Owned Nuclear Power Plant 2 Member |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 70.00% | 70.00%
Facility Name | Duane Arnold |
Gross Investment | $ 69 |
Accumulated Depreciation | 41 |
Construction Work in Progress | $ 0 |
NEER [Member] | Jointly Owned Nuclear Power Plant 3 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 88.23% |
Facility Name | Seabrook |
Gross Investment | $ 1,270 |
Accumulated Depreciation | 375 |
Construction Work in Progress | $ 45 |
NEER [Member] | Jointly Owned Electricity Generation Plant 2 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 91.19% |
Facility Name | Wyman Station Unit No. 4 |
Gross Investment | $ 29 |
Accumulated Depreciation | 7 |
Construction Work in Progress | $ 1 |
NEER [Member] | Jointly Owned Electricity Generation Plant 3 [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 65.00% |
Facility Name | Stanton |
Gross Investment | $ 137 |
Accumulated Depreciation | 7 |
Construction Work in Progress | $ 0 |
NEER [Member] | Jointly Owned Electricity Transmission and Distribution System [Member] |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 88.23% |
Facility Name | Transmission substation assets located in Seabrook, New Hampshire |
Gross Investment | $ 94 |
Accumulated Depreciation | 13 |
Construction Work in Progress | $ 14 |

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=115995737&loc=d3e659983-123033 + Details
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- Definition Identifies the name or location used by the utility of a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=115995737&loc=d3e659983-123033 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=115995737&loc=d3e659983-123033 + Details
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