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

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

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

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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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