Jointly-Owned Electric Plants (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
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		$ 1,813	[1]
Accumulated Depreciation		606	[1]
Construction Work in Progress		14
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		387	[1]
Accumulated Depreciation		195	[1]
Construction Work in Progress		14
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		1,093	[1]
Accumulated Depreciation		329	[1]
Construction Work in Progress		0
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		386	[1]
Accumulated Depreciation		104	[1]
Construction Work in Progress		41
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		965	[1]
Accumulated Depreciation		188	[1]
Construction Work in Progress		85
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		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		70	[1]
Accumulated Depreciation		15	[1]
Construction Work in Progress		$ 2

[1] Excludes nuclear fuel.