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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Increases (reductions) resulting from:      
State income taxes - net of federal income tax benefit 4.20% 2.90% 3.50%
Tax reform impact on differential membership interests 1.40% (0.00%) (0.00%)
Tax reform rate change 0.00% (41.30%) 0.00%
PTCs and ITCs - NEER (3.00%) (8.40%) (3.90%)
Amortization of deferred regulatory credit (1.80%) 0.00% 0.00%
Convertible ITCs - NEER (0.00%) 0.60% (1.70%)
Adjustments associated with Canadian assets 0.00% 0.00% (0.70%)
Other - net (0.40%) (3.00%) (0.70%)
Effective income tax rate (in hundredths) 21.40% (14.20%) 31.50%
FPL[Member]      
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 35.00%
Increases (reductions) resulting from:      
State income taxes - net of federal income tax benefit 4.50% 3.50% 3.50%
Tax reform impact on differential membership interests (0.00%) (0.00%) (0.00%)
Tax reform rate change 0.00% (0.50%) 0.00%
PTCs and ITCs - NEER (0.00%) (0.00%) (0.00%)
Amortization of deferred regulatory credit (5.00%) (0.10%) (0.10%)
Convertible ITCs - NEER (0.00%) (0.00%) (0.00%)
Adjustments associated with Canadian assets 0.00% 0.00% 0.00%
Other - net (0.60%) (0.90%) (0.60%)
Effective income tax rate (in hundredths) 19.90% 37.00% 37.80%