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Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue $ 17,997 $ 19,204 $ 16,727
Operating expenses - net 13,234 14,257 12,527
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 353 406 80
Interest expense 1,950 2,249 1,498
Interest income 38 54 51
Depreciation and amortization 4,052 4,216 3,911
Equity in earnings (losses) of equity method investees (1,351) 66 358
Income Tax Expense (Benefit) 44 448 1,576
Net income (loss) 2,369 3,388 5,776
Net income (loss) attributable to NEE 2,919 3,769 6,638
Capital expenditures, independent power and other investments and nuclear fuel purchases 14,610 17,462 13,004
Total property, plant and equipment - net 91,803 82,010 70,334
Total assets 127,684 117,691 103,702
Investment in equity method investees 5,728 7,453 6,748
FPL[Member]      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue 11,662 12,192 11,862
Operating expenses - net 7,862 8,890 8,708
Interest expense 600 594 541
Depreciation and amortization 2,246 2,524 2,633
Income Tax Expense (Benefit) 610 441 539
Net income (loss) [1] 2,650 2,334 2,171
Electric utility plant and other property - net 48,933 45,074  
Total assets $ 61,610 57,188  
NEER [Member]      
Segment Reporting Information [Line Items]      
Deemed capital structure of NextEra Energy Resources (in hundredths) 70.00%    
Operating Segments [Member] | FPL[Member]      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue $ 11,662 12,192 11,862
Operating expenses - net 7,862 8,895 8,714
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 0 5 6
Interest expense 600 594 541
Interest income 2 5 4
Depreciation and amortization 2,246 2,524 2,633
Equity in earnings (losses) of equity method investees 0 0 0
Income Tax Expense (Benefit) 610 441 539
Net income (loss) 2,650 2,334 2,171
Net income (loss) attributable to NEE 2,650 2,334 2,171
Capital expenditures, independent power and other investments and nuclear fuel purchases 6,680 5,755 5,135
Electric utility plant and other property - net 48,933 45,074 41,499
Total assets 61,610 57,188 53,484
Investment in equity method investees 0 0 0
Operating Segments [Member] | Gulf Power Segment [Member]      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue 1,398 1,487  
Operating expenses - net 1,081 1,216  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 0 0  
Interest expense 41 55  
Interest income 2 3  
Depreciation and amortization 281 247  
Equity in earnings (losses) of equity method investees 0 0  
Income Tax Expense (Benefit) 67 42  
Net income (loss) 238 180  
Net income (loss) attributable to NEE 238 180  
Capital expenditures, independent power and other investments and nuclear fuel purchases 1,012 729  
Electric utility plant and other property - net 4,946 4,763  
Total assets 6,725 5,855  
Investment in equity method investees 0 0  
Operating Segments [Member] | NEER [Member]      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue 5,046 5,639 4,984
Operating expenses - net 4,125 4,037 3,698
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 363 402 82
Interest expense 659 873 595
Interest income 28 38 40
Depreciation and amortization 1,460 1,387 1,230
Equity in earnings (losses) of equity method investees (1,351) 67 321
Income Tax Expense (Benefit) (416) 162 1,196
Net income (loss) (19) 1,426 3,842
Net income (loss) attributable to NEE 531 1,807 4,704
Capital expenditures, independent power and other investments and nuclear fuel purchases 6,893 6,505 7,189
Total property, plant and equipment - net 37,842 32,042 28,602
Total assets 55,633 51,516 44,509
Investment in equity method investees 5,713 7,453 6,521
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Regulated and Unregulated Operating Revenue (109) (114) (119)
Operating expenses - net 166 109 115
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal (10) (1) (8)
Interest expense 650 727 362
Interest income 6 8 7
Depreciation and amortization 65 58 48
Equity in earnings (losses) of equity method investees 0 (1) 37
Income Tax Expense (Benefit) (217) (197) (159)
Net income (loss) (500) (552) (237)
Net income (loss) attributable to NEE (500) (552) (237)
Capital expenditures, independent power and other investments and nuclear fuel purchases 25 4,473 680
Total property, plant and equipment - net 82 131 233
Total assets 3,716 3,132 5,709
Investment in equity method investees $ 15 $ 0 $ 227
[1] FPL's comprehensive income is the same as reported net income.