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Commitments and Contingencies (Legal Proceedings) (Details) (USD $)
 12 Months Ended 24 Months Ended
Dec. 31, 2014
Dec. 31, 1996
Jan. 29, 1999
Legal Proceedings [Abstract]      
FPL's interest owned in generation facility Scherer Unit No. 4 (in hundredths) 76.00%nee_InterestOwnedInGenerationFacility    
Maximum amount of civil penalties per day - Clean Air Act from June 1, 1975 through January 30, 1997 $ 25,000nee_MaximumDailyCleanAirActCivilPenaltiesPeriod1    
Maximum amount of civil penalties per day - Clean Air Act from January 31, 1997 through March 15, 2004 27,500nee_MaximumDailyCleanAirActCivilPenaltiesPeriod2    
Maximum amount of civil penalties per day - Clean Air Act from March 16, 2004 through January 12, 2009 32,500nee_MaximumDailyCleanAirActCivilPenaltiesPeriod3    
Maximum amount of civil penalties per day - Clean Air Act from January 13, 2009 forward 37,500nee_MaximumDailyCleanAirActCivilPenaltiesPeriod4    
Shares of Adelphia common stock purchased (in shares)   1,091,524nee_CommonStockSharesPurchased  
Shares of Adelphia preferred stock purchased (in shares)   20,000nee_PreferredStockSharesPurchased  
Shares of Adelphia common stock if Adelphia preferred stock converted to Adelphia common stock (in shares)   2,358,490nee_ConvertibleSharesPurchased  
Aggregate price paid for Adelphia common and preferred stock   35,900,000nee_AggregatePriceForShares  
Cash paid by Adelphia for repurchase of Adelphia acquired shares     $ 149,213,130nee_CashPaidForRepurchaseOfAcquiredShares