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Jointly-Owned Electric Plants (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Impairment charges | $ 446 | $ 7 | $ 2
FPL[Member] | Jointly Owned Nuclear Power Plant 1 [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | St. Lucie Unit No. 2 |  |
Proportionate ownership share | 85.00% |  |
Gross Investment | $ 2,205 |  |
Accumulated Depreciation | 863 |  |
Construction Work in Progress | $ 36 |  |
FPL[Member] | Jointly Owned Nuclear Power Plant 2 [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | St. Johns River Power Park units and coal terminal |  |
Proportionate ownership share | 20.00% |  |
Gross Investment | $ 394 |  |
Accumulated Depreciation | 215 |  |
Construction Work in Progress | $ 0 |  |
FPL[Member] | Jointly Owned Nuclear Power Plant 3 [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | Scherer Unit No. 4 |  |
Proportionate ownership share | 76.00% |  |
Gross Investment | $ 1,146 |  |
Accumulated Depreciation | 419 |  |
Construction Work in Progress | 24 |  |
NEER [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Impairment charges | $ 420 |  |
NEER [Member] | Jointly Owned Electricity Generation Plant 1 [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | Duane Arnold |  |
Proportionate ownership share | 70.00% |  |
Gross Investment | $ 61 |  |
Accumulated Depreciation | 0 |  |
Construction Work in Progress | $ 4 |  |
NEER [Member] | Jointly Owned Electricity Generation Plant 2 [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | Seabrook |  |
Proportionate ownership share | 88.23% |  |
Gross Investment | $ 1,181 |  |
Accumulated Depreciation | 302 |  |
Construction Work in Progress | $ 78 |  |
NEER [Member] | Jointly Owned Electricity Generation Plant 3 [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | Wyman Station Unit No. 4 |  |
Proportionate ownership share | 87.49% |  |
Gross Investment | $ 26 |  |
Accumulated Depreciation | 4 |  |
Construction Work in Progress | $ 0 |  |
Corporate and Other [Member] | Jointly Owned Electricity Transmission and Distribution System [Member] |  |  |
Proportionate ownership interest In jointly-owned facilities [Abstract] |  |  |
Facility Name | Transmission substation assets located in Seabrook, New Hampshire |  |
Proportionate ownership share | 88.23% |  |
Gross Investment | $ 78 |  |
Accumulated Depreciation | 14 |  |
Construction Work in Progress | $ 3 |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + Details
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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://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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- Definition Identifies the name or location used by the utility of a jointly owned utility plant. + 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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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + 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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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + 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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