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Summarized Financial Information of NEECH - Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues | $ 4,588 | $ 5,572 | $ 4,970 | $ 4,075 | $ 4,390 | $ 4,416 | $ 4,063 | $ 3,857 | $ 19,204 | $ 16,727 | $ 17,173
Operating expenses - net |  |  |  |  |  |  |  |  | (13,851) | (12,447) | (12,000)
Interest expense |  |  |  |  |  |  |  |  | (2,249) | (1,498) | (1,558)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 66 | 358 | 141
Gain on NEP deconsolidation |  |  |  |  |  |  |  |  | 0 | 3,927 | 0
Other income - net |  |  |  |  |  |  |  |  | 666 | 285 | 907
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 3,836 | 7,352 | 4,663
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 448 | 1,576 | (660)
NET INCOME | 844 | 798 | 1,139 | 606 | 314 | 941 | 687 | 3,834 | 3,388 | 5,776 | 5,323
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | 381 | 862 | 57
NET INCOME ATTRIBUTABLE TO NEE | $ 975 | $ 879 | $ 1,234 | $ 680 | $ 422 | $ 1,005 | $ 781 | $ 4,431 | 3,769 | 6,638 | 5,380
Reportable Legal Entities [Member] | NEE (Guarantor) [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating expenses - net |  |  |  |  |  |  |  |  | (209) | (196) | (175)
Interest expense |  |  |  |  |  |  |  |  | (3) | (17) | (3)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 3,785 | 6,548 | 5,393
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on NEP deconsolidation |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income - net |  |  |  |  |  |  |  |  | 185 | 169 | 151
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 3,758 | 6,504 | 5,366
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (11) | (134) | (14)
NET INCOME |  |  |  |  |  |  |  |  | 3,769 | 6,638 | 5,380
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | 0 | 0 | 0
NET INCOME ATTRIBUTABLE TO NEE |  |  |  |  |  |  |  |  | $ 3,769 | 6,638 | 5,380
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Ownership interest | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 5,671 | 5,007 | 5,301
Operating expenses - net |  |  |  |  |  |  |  |  | (3,669) | (3,652) | (3,273)
Interest expense |  |  |  |  |  |  |  |  | (1,596) | (940) | (1,074)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 66 | 358 | 141
Gain on NEP deconsolidation |  |  |  |  |  |  |  |  | 0 | 3,927 | 0
Other income - net |  |  |  |  |  |  |  |  | 407 | 21 | 702
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 879 | 4,721 | 1,797
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (21) | 1,195 | (1,719)
NET INCOME |  |  |  |  |  |  |  |  | 900 | 3,526 | 3,516
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | 381 | 862 | 57
NET INCOME ATTRIBUTABLE TO NEE |  |  |  |  |  |  |  |  | 1,281 | 4,388 | 3,573
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 13,533 | 11,720 | 11,872
Operating expenses - net |  |  |  |  |  |  |  |  | (9,973) | (8,599) | (8,552)
Interest expense |  |  |  |  |  |  |  |  | (650) | (541) | (481)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (3,785) | (6,548) | (5,393)
Equity in earnings of equity method investees |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on NEP deconsolidation |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income - net |  |  |  |  |  |  |  |  | 74 | 95 | 54
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (801) | (3,873) | (2,500)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 480 | 515 | 1,073
NET INCOME |  |  |  |  |  |  |  |  | (1,281) | (4,388) | (3,573)
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | 0 | 0 | 0
NET INCOME ATTRIBUTABLE TO NEE |  |  |  |  |  |  |  |  | $ (1,281) | $ (4,388) | $ (3,573)

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