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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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% 0.40% 1.80%
PTCs and ITCs - NEER (in hundredths) (3.90%) (4.10%) (5.10%)
Convertible ITCs - NEER (in hundredths) (1.70%) (0.80%) (1.40%)
Adjustments associated with Canadian assets (in hundredths) (0.70%) 0.00% 1.30%
Other - net (in hundredths) (0.70%) 0.30% 0.70%
Effective income tax rate (in hundredths) 31.50% 30.80% 32.30%
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% 3.40% 3.40%
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) (0.70%) (1.70%) (0.90%)
Effective income tax rate (in hundredths) 37.80% 36.70% 37.50%