Jointly-Owned Electric Plants (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
FPL [Member] \| Jointly Owned Nuclear Power Plant 1 [Member]
Proportionate ownership interest In jointly-owned facilities [Abstract]
Facility Name	St. Lucie Unit No. 2
Ownership Interest (in hundredths)	85.00%
Gross Investment	$ 2,172
Accumulated Depreciation	815
Construction Work in Progress	$ 33
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
Ownership Interest (in hundredths)	20.00%
Gross Investment	$ 393
Accumulated Depreciation	208
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
Ownership Interest (in hundredths)	76.00%
Gross Investment	$ 1,138
Accumulated Depreciation	395
Construction Work in Progress	$ 3
NEER [Member] \| Jointly Owned Electricity Generation Plant 1 [Member]
Proportionate ownership interest In jointly-owned facilities [Abstract]
Facility Name	Duane Arnold
Ownership Interest (in hundredths)	70.00%
Gross Investment	$ 466
Accumulated Depreciation	146
Construction Work in Progress	$ 16
NEER [Member] \| Jointly Owned Electricity Generation Plant 2 [Member]
Proportionate ownership interest In jointly-owned facilities [Abstract]
Facility Name	Seabrook
Ownership Interest (in hundredths)	88.23%
Gross Investment	$ 1,138
Accumulated Depreciation	271
Construction Work in Progress	$ 77
NEER [Member] \| Jointly Owned Electricity Generation Plant 3 [Member]
Proportionate ownership interest In jointly-owned facilities [Abstract]
Facility Name	Wyman Station Unit No. 4
Ownership Interest (in hundredths)	84.35%
Gross Investment	$ 25
Accumulated Depreciation	3
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
Ownership Interest (in hundredths)	88.23%
Gross Investment	$ 76
Accumulated Depreciation	17
Construction Work in Progress	$ 3

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

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

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- Definition

Identifies the name or location used by the utility of a jointly owned utility plant.

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- Definition

The period end amount of construction work in progress at a jointly owned electricity generation plant.

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

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