Summary of Significant Accounting and Reporting Policies (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended			22 Months Ended	50 Months Ended	1 Months Ended
	Mar. 31, 2010	Dec. 31, 2010	Dec. 31, 2011 Years MW	Dec. 31, 2010 Years	Dec. 31, 2009	Dec. 31, 2011 kWh	Feb. 28, 2010	Jan. 31, 2012 Intent to Initiate Base Rate Proceedings [Member]
Basis of Presentation [Abstract]
Approximate number of customer accounts			4,600,000			4,600,000
Regulation [Abstract]
Number of additional nuclear units for which pre-construction costs and carrying charges are recovered			2
Additional baseload capacity, low range (in megawatts)			450
Additional baseload capacity, high range (in megawatts)			490
Number of solar generating facilities for which pre-construction costs and carrying charges are recovered			3
Revenues and Rates [Abstract]
FPL unbilled base revenues included in customer receivables		$ 148,000,000	$ 160,000,000	$ 148,000,000		$ 160,000,000
Franchise fees and gross receipts taxes			716,000,000	687,000,000	791,000,000
Surcharges related to storm-recovery			100,000,000	101,000,000	91,000,000
FPSC rate order - 2010 rate agreement [Abstract]
Increase in base rate revenues						75,000,000
Regulatory return on common equity (in hundredths)						10.00%
Regulatory return on common equity range (in hundredths)						1.00%
Adjusted regulatory equity ratio (in hundredths)						59.10%
Depreciation reserve surplus						895,000,000
Key elements of the stipulation and settlement agreement [Abstract]
Minimum days from the filing of a petition that future storm restoration costs are recoverable (in days)						60
Maximum surcharge						4
Increment of usage on which surcharge is based (in kilowatt-hours)						1,000
Threshold of storm restoration costs in any given calendar year at which surcharge may be increased						800,000,000
Earned regulatory ROE threshold below which retail base rate relief may be sought (in hundredths)			9.00%			9.00%
Maximum amount of surplus depreciation taken in any one calendar year			267,000,000			267,000,000
Maximum amount of surplus depreciation that may be used over the course of the agreement			776,000,000			776,000,000
Earned regulatory ROE threshold above which retail base rate reduction may be sought (in hundredths)			11.00%			11.00%
Amount of surplus depreciation credit cap recognized			187,000,000	4,000,000
2005 rate agreement [Abstract]
Number of power plants that achieved commercial operation							3
Allowed annual reduction of depreciation on plant in service			125,000,000				125,000,000
2012 base rate proceeding [Abstract]
Requested increase in base rates								525,000,000
Requested increase in base rates, when Cape Canaveral plant becomes operational								170,000,000
Requested allowed regulatory ROE								11.25%
Requested allowed regulatory ROE adder for lowest bill								0.25%
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of electric generating assets to gross investment in electric utility plant in service (in hundredths)			48.00%			48.00%
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths)			12.00%			12.00%
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths)			36.00%			36.00%
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths)			4.00%			4.00%
Net book value of assets serving as collateral			8,000,000,000			8,000,000,000
Convertible ITCs			1,200,000,000	1,000,000,000
Convertible ITCs included in other receivables		429,000,000	95,000,000	429,000,000		95,000,000
Maximum interval between depreciation studies performed and filed with the FPSC (in years)			4
FPL's composite depreciation rate for electric plant in service (in hundredths)			3.20%	3.20%	3.60%
NextEra Energy Resources' effective depreciation rates, excluding decommissioning (in hundredths)			4.00%	4.40%	4.20%
Equipment, estimated useful lives (in years)			30	25
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%		7.41%
AFUDC capitalized for FPL			50,000,000	50,000,000	74,000,000
Project development costs of NextEra Energy Resources		99,000,000	89,000,000	99,000,000		89,000,000
Interest capitalized on construction projects of NextEra Energy Resources			104,000,000	71,000,000	85,000,000
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
FPL's portion of the ultimate costs of nuclear decommissioning, expressed in current year dollars			2,300,000,000			2,300,000,000
FPL's fund earnings on decommissioning funds			66,000,000	76,000,000	81,000,000
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, 2007				15,000,000
Plant dismantlement expense approved by the FPSC, effective January 1, 2010				18,000,000
FPL's portion of the ultimate costs of dismantlement			860,000,000			860,000,000
FPL's portion of the ultimate costs of plant dismantlement, expressed in current year dollars			421,000,000			421,000,000
NextEra Energy Resources' ARO related to nuclear decommissioning		478,000,000	383,000,000	478,000,000		383,000,000
NextEra Energy Resources' portion of the ultimate costs of nuclear decommissioning			11,400,000,000			11,400,000,000
NextEra Energy Resources' portion of the ultimate costs of nuclear decommissioning, expressed in current year dollars			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		58,000,000	49,000,000	58,000,000		49,000,000
Nuclear maintenance costs			97,000,000	100,000,000	84,000,000
Capitalized major maintenance costs		95,000,000	133,000,000	95,000,000		133,000,000
Major maintenance costs			77,000,000	88,000,000	73,000,000
Restricted Cash [Abstract]
Restricted cash, current		111,000,000	88,000,000	111,000,000		88,000,000
Restricted cash, noncurrent			565,000,000			565,000,000
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract]
Storm fund included in special use funds		125,000,000	125,000,000	125,000,000		125,000,000
Storm reserve included in regulatory liabilities			54,000,000			54,000,000
Capacity to absorb storm restoration costs			202,000,000			202,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules		151,000,000	171,000,000	151,000,000		171,000,000
Deferred income tax benefit associated with convertible ITCs			$ 56,000,000	$ 58,000,000