Jointly-Owned Electric Plants (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
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	$ 1,424	[1]
Accumulated Depreciation	550	[1]
Construction Work in Progress	138
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	389	[1]
Accumulated Depreciation	157	[1]
Construction Work in Progress	6
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	720	[1]
Accumulated Depreciation	232	[1]
Construction Work in Progress	323
NextEra Energy Resources [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	330	[1]
Accumulated Depreciation	76	[1]
Construction Work in Progress	50
NextEra Energy Resources [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	884	[1]
Accumulated Depreciation	145	[1]
Construction Work in Progress	75
NextEra Energy Resources [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	105	[1]
Accumulated Depreciation	41	[1]
Construction Work in Progress	1
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	60	[1]
Accumulated Depreciation	12	[1]
Construction Work in Progress	$ 2

[1] Excludes nuclear fuel.