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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
OPERATING REVENUES $ 4,069 $ 4,404 [1] $ 7,932 $ 8,377 [1]  
Operating expenses (income) - net 2,907 3,128 [1] 5,723 4,739 [1]  
Net income (loss) attributable to NEE $ 795 793 [1] $ 5,223 2,376 [1]  
Deemed capital structure of NextEra Energy Resources 70.00%   70.00%    
Total assets $ 95,490   $ 95,490   $ 97,827
FPL [Member]          
Segment Reporting Information [Line Items]          
OPERATING REVENUES 2,908 3,091 5,528 5,618  
Operating expenses (income) - net 1,986 2,150 3,899 3,866  
Net income (loss) attributable to NEE [2] 626 526 1,110 971 [3]  
Total assets 51,611   51,611   50,244
Operating Segments [Member] | FPL [Member]          
Segment Reporting Information [Line Items]          
OPERATING REVENUES 2,908 3,091 5,528 5,618  
Operating expenses (income) - net 1,986 2,150 3,899 3,866  
Net income (loss) attributable to NEE 626 526 1,110 971  
Total assets 51,611   51,611   50,244
Operating Segments [Member] | NextEra Energy Resources [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 1,162 1,295 2,408 2,719  
Operating expenses (income) - net 877 957 1,738 1,888  
Net income (loss) attributable to NEE 274 301 4,200 777  
Total assets 42,052   42,052   45,549
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Operating revenues (1) 18 (4) 40  
Operating expenses (income) - net 44 21 86 (1,015)  
Net income (loss) attributable to NEE (105) $ (34) (87) $ 628  
Total assets $ 1,827   $ 1,827   $ 2,034
[1] Prior period amounts have been retrospectively adjusted as discussed in Note 3 - Amendments to Presentation of Retirement Benefits.
[2] FPL's comprehensive income is the same as reported net income.
[3] Prior period amounts have been retrospectively adjusted as discussed in Note 11 - Restricted Cash.