Jointly-Owned Electric Plants (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
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	$ 1,808	[1]
Accumulated Depreciation	573	[1]
Construction Work in Progress	1
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	386	[1]
Accumulated Depreciation	173	[1]
Construction Work in Progress	11
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	1,067	[1]
Accumulated Depreciation	271	[1]
Construction Work in Progress	14
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	366	[1]
Accumulated Depreciation	88	[1]
Construction Work in Progress	48
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	924	[1]
Accumulated Depreciation	164	[1]
Construction Work in Progress	91
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	109	[1]
Accumulated Depreciation	44	[1]
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	66	[1]
Accumulated Depreciation	14	[1]
Construction Work in Progress	$ 1

[1] Excludes nuclear fuel.