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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 4,010 | $ 4,808 | $ 4,404 | $ 3,972 | $ 3,699 | $ 4,805 | $ 3,817 | $ 3,835 | $ 17,195 | $ 16,155 | $ 17,486
Operating expenses - net |  |  |  |  |  |  |  |  | 11,869 | 11,547 | 12,854
Interest expense |  |  |  |  |  |  |  |  | 1,558 | 1,093 | 1,211
Interest income |  |  |  |  |  |  |  |  | 81 | 82 | 86
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,357 | 3,077 | 2,831
Equity in losses (earnings) of equity method investees |  |  |  |  |  |  |  |  | 141 | 148 | 107
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (653) | 1,383 | 1,228
Net income (loss) | 2,068 | 856 | 804 | 1,591 | 1,017 | 789 | 544 | 654 | 5,320 | 3,005 | 2,762
Net income (loss) attributable to NEE | 2,155 | $ 847 | $ 793 | $ 1,583 | 966 | $ 753 | $ 540 | $ 653 | 5,378 | 2,912 | 2,752
Capital expenditures, independent power and other investments and nuclear fuel purchases |  |  |  |  |  |  |  |  | 10,740 | 9,636 | 8,377
Property, plant and equipment | 93,783 |  |  |  | 87,013 |  |  |  | 93,783 | 87,013 | 80,330
Accumulated depreciation and amortization | 21,367 |  |  |  | 20,101 |  |  |  | 21,367 | 20,101 | 18,944
Total assets | 97,827 |  |  |  | 89,993 |  |  |  | 97,827 | 89,993 | 82,479
Investment in equity method investees | $ 2,321 |  |  |  | 1,767 |  |  |  | $ 2,321 | 1,767 | 1,063
NEER [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deemed capital structure of NextEra Energy Resources (in hundredths) | 70.00% |  |  |  |  |  |  |  | 70.00% |  |
Operating Segments [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 11,972 | 10,895 | 11,651
Operating expenses - net |  |  |  |  |  |  |  |  | 8,581 | 7,737 | 8,674
Interest expense |  |  |  |  |  |  |  |  | 482 | 456 | 445
Interest income |  |  |  |  |  |  |  |  | 2 | 2 | 7
Depreciation and amortization |  |  |  |  |  |  |  |  | 933 | 1,651 | 1,576
Equity in losses (earnings) of equity method investees |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,106 | 1,051 | 957
Net income (loss) |  |  |  |  |  |  |  |  | 1,880 | 1,727 | 1,648
Net income (loss) attributable to NEE |  |  |  |  |  |  |  |  | 1,880 | 1,727 | 1,648
Capital expenditures, independent power and other investments and nuclear fuel purchases |  |  |  |  |  |  |  |  | 5,291 | 3,934 | 3,633
Property, plant and equipment | $ 51,982 |  |  |  | 48,313 |  |  |  | 51,982 | 48,313 | 45,383
Accumulated depreciation and amortization - FPL | 12,802 |  |  |  | 12,304 |  |  |  | 12,802 | 12,304 | 11,862
Total assets | 50,244 |  |  |  | 45,501 |  |  |  | 50,244 | 45,501 | 42,523
Investment in equity method investees | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Operating Segments [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 5,186 | 4,893 | 5,444
Operating expenses - net |  |  |  |  |  |  |  |  | 4,318 | 3,419 | 3,865
Interest expense |  |  |  |  |  |  |  |  | 801 | 732 | 625
Interest income |  |  |  |  |  |  |  |  | 72 | 34 | 28
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,398 | 1,366 | 1,183
Equity in losses (earnings) of equity method investees |  |  |  |  |  |  |  |  | 136 | 119 | 103
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (2,025) | 242 | 289
Net income (loss) |  |  |  |  |  |  |  |  | 2,905 | 1,218 | 1,102
Net income (loss) attributable to NEE |  |  |  |  |  |  |  |  | 2,963 | 1,125 | 1,092
Capital expenditures, independent power and other investments and nuclear fuel purchases |  |  |  |  |  |  |  |  | 5,375 | 5,521 | 4,661
Property, plant and equipment | 40,767 |  |  |  | 37,644 |  |  |  | 40,767 | 37,644 | 33,340
Accumulated depreciation and amortization | 8,452 |  |  |  | 7,655 |  |  |  | 8,452 | 7,655 | 6,640
Total assets | 45,549 |  |  |  | 41,743 |  |  |  | 45,549 | 41,743 | 37,647
Investment in equity method investees | 2,153 |  |  |  | 1,661 |  |  |  | 2,153 | 1,661 | 983
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 37 | 367 | 391
Operating expenses - net |  |  |  |  |  |  |  |  | (1,030) | 391 | 315
Interest expense |  |  |  |  |  |  |  |  | 275 | (95) | 141
Interest income |  |  |  |  |  |  |  |  | 7 | 46 | 51
Depreciation and amortization |  |  |  |  |  |  |  |  | 26 | 60 | 72
Equity in losses (earnings) of equity method investees |  |  |  |  |  |  |  |  | 5 | 29 | 4
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 266 | 90 | (18)
Net income (loss) |  |  |  |  |  |  |  |  | 535 | 60 | 12
Net income (loss) attributable to NEE |  |  |  |  |  |  |  |  | 535 | 60 | 12
Capital expenditures, independent power and other investments and nuclear fuel purchases |  |  |  |  |  |  |  |  | 74 | 181 | 83
Property, plant and equipment | 1,034 |  |  |  | 1,056 |  |  |  | 1,034 | 1,056 | 1,607
Accumulated depreciation and amortization | 113 |  |  |  | 142 |  |  |  | 113 | 142 | 442
Total assets | 2,034 |  |  |  | 2,749 |  |  |  | 2,034 | 2,749 | 2,309
Investment in equity method investees | $ 168 |  |  |  | $ 106 |  |  |  | $ 168 | $ 106 | $ 80

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