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Segment Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Deemed capital structure of NextEra Energy Resources (in hundredths) 70.00%    
Percentage of operating revenues derived from the sale of electricity (in hundredths) 92.00% 91.00% 92.00%
Maximum percentage of operating revenues from foreign sources (in hundredths) 2.00% 2.00% 1.00%
Maximum percentage of long-lived assets located in foreign countries (in hundredths) 3.00% 4.00%  
Impairment charges $ 2 $ 11 $ 300
NEER [Member]      
Segment Reporting Information [Line Items]      
Deemed capital structure of NextEra Energy Resources (in hundredths) 70.00%    
NEER [Member]      
Segment Reporting Information [Line Items]      
Deemed capital structure of NextEra Energy Resources (in hundredths) 70.00%    
NEER [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Segment Reporting Information [Line Items]      
Impairment charges     300
Impairment charges, after-tax     342
Adjustments for New Accounting Pronouncement [Member]      
Segment Reporting Information [Line Items]      
Reclassification of debt issuance costs   324 298
Adjustments for New Accounting Pronouncement [Member] | FPL [Member]      
Segment Reporting Information [Line Items]      
Reclassification of debt issuance costs   $ 85 $ 68