Summary of Significant Accounting and Reporting Policies (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended			34 Months Ended	12 Months Ended		48 Months Ended
	Mar. 31, 2010	Dec. 31, 2010	Dec. 31, 2012 MW	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 MW	Dec. 31, 2012 FPL [Member]	Dec. 31, 2011 FPL [Member]	Dec. 31, 2016 Forecast [Member] kWh
Basis of Presentation [Abstract]
Approximate number of customer accounts			4,600,000			4,600,000
Capacity of Facilities Under Differential Membership Agreements			3,059			3,059
Revenues and Rates [Abstract]
FPL unbilled base revenues included in customer receivables			$ 175,000,000	$ 160,000,000		$ 175,000,000
Franchise fees and gross receipts taxes			684,000,000	716,000,000	687,000,000
Surcharges related to storm-recovery			106,000,000	100,000,000	101,000,000
FPSC rate orders [Abstract]
Increase in base rate revenues						75,000,000			350,000,000
Regulatory return on common equity (in hundredths)						10.00%			10.50%
Regulatory return on common equity range (in hundredths)						1.00%			1.00%
Earned regulatory ROE threshold below which retail base rate relief may be sought (in hundredths)						9.00%			9.50%
Maximum surcharge									4
Minimum depreciation reserve surplus that must be amortized under 2012 rate agreement									224,000,000
Maximum amount of fossil dismantlement reserve that may be amortized under the 2012 rate agreement									176,000,000
Maximum amount of surplus depreciation taken in any one calendar year						267,000,000
Maximum amount of surplus depreciation that may be used over the course of the agreement						776,000,000
Earned regulatory ROE threshold above which retail base rate reduction may be sought (in hundredths)						11.00%			11.50%
Threshold of storm restoration costs in any given calendar year at which surcharge may be increased									800,000,000
Increment of usage on which surcharge is based (in kilowatt-hours)									1,000
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of electric generating assets to gross investment in electric utility plant in service (in hundredths)			50.00%			50.00%
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths)			11.00%			11.00%
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths)			34.00%			34.00%
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths)			5.00%			5.00%
Net book value of assets serving as collateral			8,300,000,000			8,300,000,000
Convertible ITCs			1,400,000,000	1,100,000,000			171,000,000	178,000,000
Convertible ITCs included in other receivables			170,000,000	95,000,000		170,000,000
Maximum interval between depreciation studies performed and filed with the FPSC (in years)			4
Amount of surplus depreciation credit cap recognized			480,000,000	187,000,000	4,000,000
FPL's composite depreciation rate for electric plant in service (in hundredths)			3.30%	3.20%	3.20%
Portion of electric utility plant in service and other property to be retired and dismantled			309,000,000			309,000,000
Portion of accumulated depreciation and amortization to be retired and dismantled			258,000,000			258,000,000
NextEra Energy Resources' effective depreciation rates, excluding decommissioning (in hundredths)			4.10%	4.00%	4.40%
Equipment, estimated useful lives (in years)				30 years	25 years
Reduction in depreciation and amortization due to change in estimate			75,000,000
Increase in net income due to change in estimate			44,000,000
Increase in basic and diluted earnings per share due to change in estimate			$ 0.11
Construction Activity [Abstract]
Threshold of plant in service balance at which AFUDC may be recorded (in hundredths)			0.50%
AFUDC capitalization rate for FPL (in hundredths)	7.41%	6.41%	6.41%	6.41%
AFUDC capitalized for FPL			74,000,000	50,000,000	50,000,000
Project development costs of NextEra Energy Resources			106,000,000	89,000,000		106,000,000
Interest capitalized on construction projects of NextEra Energy Resources			139,000,000	104,000,000	71,000,000
Deemed capital structure of NextEra Energy Resources (in hundredths)			70.00%			70.00%
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Maximum interval between nuclear decommissioning studies submitted to the FPSC for approval (in years)			5
For FPL, number of nuclear units			4
FPL's portion of the ultimate costs of nuclear decommissioning			6,200,000,000			6,200,000,000
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Subsidiary			2,400,000,000			2,400,000,000
FPL's fund earnings on decommissioning funds			98,000,000	66,000,000	76,000,000
Maximum interval between plant dismantlement studies submitted to the FPSC for approval (in years)			4
Plant dismantlement expense approved by the FPSC, effective January 1, 2010			18,000,000
Ultimate Costs Of Plant Dismantlement			782,000,000			782,000,000
Ultimate Costs Of Plant Dismantlement In Current Year Dollars			369,000,000			369,000,000
NextEra Energy Resources' ARO related to nuclear decommissioning			408,000,000	383,000,000		408,000,000
Ultimate Costs Of Nuclear Decommissioning For Wholly Owned Indirect Subsidiary			11,900,000,000			11,900,000,000
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Indirect Subsidiary			1,900,000,000			1,900,000,000
Effective period for Seabrook's decommissioning funding plan (in years)			4
Major Maintenance Costs [Abstract]
Accrued liability for nuclear maintenance costs			35,000,000	49,000,000		35,000,000
Nuclear maintenance costs			104,000,000	97,000,000	100,000,000
Capitalized major maintenance costs			148,000,000	133,000,000		148,000,000
Major maintenance costs			100,000,000	77,000,000	88,000,000
Restricted Cash [Abstract]
Restricted cash, current			149,000,000	88,000,000		149,000,000	38,000,000	37,000,000
Restricted cash, noncurrent			251,000,000	565,000,000		251,000,000
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract]
Storm fund included in special use funds			73,000,000	125,000,000		73,000,000
Capacity to absorb storm restoration costs			117,000,000			117,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules			206,000,000	171,000,000		206,000,000
Deferred income tax benefit associated with convertible ITCs			$ 54,000,000	$ 56,000,000