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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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) 2.90% 3.50% 0.40%
Tax reform rate change (41.20%) 0.00% 0.00%
PTCs and ITCs - NEER (in hundredths) (8.40%) (3.90%) (4.10%)
Convertible ITCs - NEER (in hundredths) 0.60% (1.70%) (0.80%)
Adjustments associated with Canadian assets (in hundredths) 0.00% (0.70%) 0.00%
Other - net (in hundredths) (2.90%) (0.70%) 0.30%
Effective income tax rate (in hundredths) (14.00%) 31.50% 30.80%
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) 3.50% 3.50% 3.40%
Tax reform rate change (0.50%) 0.00% 0.00%
PTCs and ITCs - NEER (in hundredths) 0.00% 0.00% 0.00%
Convertible ITCs - NEER (in hundredths) 0.00% 0.00% 0.00%
Adjustments associated with Canadian assets (in hundredths) 0.00% 0.00% 0.00%
Other - net (in hundredths) (1.00%) (0.70%) (1.70%)
Effective income tax rate (in hundredths) 37.00% 37.80% 36.70%