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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Statutory federal income tax rate (in hundredths) 35.00% 35.00% 35.00%
Increases (reductions) resulting from:      
State income taxes - net of federal income tax benefit (in hundredths) 0.40% 1.80% 1.80%
PTCs and ITCs - NEER (in hundredths) (4.10%) (5.10%) (8.50%)
Convertible ITCs - NEER (in hundredths) (0.80%) (1.40%) (2.50%)
Valuation allowance associated with Spain solar projects (in hundredths) 0.00% 0.70% 5.20%
Charges associated with Canadian assets (in hundredths) 0.00% 1.30% 0.00%
Other - net (in hundredths) 0.30% 0.00% 0.70%
Effective income tax rate (in hundredths) 30.80% 32.30% 31.70%
FPL [Member]      
Operating Loss Carryforwards [Line Items]      
Statutory federal income tax rate (in hundredths) 35.00% 35.00% 35.00%
Increases (reductions) resulting from:      
State income taxes - net of federal income tax benefit (in hundredths) 3.40% 3.40% 3.60%
PTCs and ITCs - NEER (in hundredths) 0.00% 0.00% 0.00%
Convertible ITCs - NEER (in hundredths) 0.00% 0.00% 0.00%
Valuation allowance associated with Spain solar projects (in hundredths) 0.00% 0.00% 0.00%
Charges associated with Canadian assets (in hundredths) 0.00% 0.00% 0.00%
Other - net (in hundredths) (1.70%) (0.90%) (0.40%)
Effective income tax rate (in hundredths) 36.70% 37.50% 38.20%