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Summarized Financial Information of NEECH - Income Statement (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
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)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income - net |  |  |  |  |  |  |  |  | 899 | 873 | 569
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 4,667 | 4,388 | 3,990
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
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | (58) | 93 | 10
Net income (loss) attributable to NEE | $ 2,155 | $ 847 | $ 793 | $ 1,583 | $ 966 | $ 753 | $ 540 | $ 653 | 5,378 | 2,912 | 2,752
Reportable Legal Entities [Member] | NEE (Guarantor) [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating expenses - net |  |  |  |  |  |  |  |  | (25) | (20) | (17)
Interest expense |  |  |  |  |  |  |  |  | (3) | (1) | (4)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 5,391 | 2,956 | 2,754
Other income - net |  |  |  |  |  |  |  |  | 2 | 5 | 1
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 5,365 | 2,940 | 2,734
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (14) | 28 | (18)
Net income (loss) |  |  |  |  |  |  |  |  | 5,379 | 2,912 | 2,752
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to NEE |  |  |  |  |  |  |  |  | $ 5,379 | 2,912 | 2,752
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Ownership interest | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 5,322 | 5,283 | 5,849
Operating expenses - net |  |  |  |  |  |  |  |  | (3,293) | (3,663) | (4,142)
Interest expense |  |  |  |  |  |  |  |  | (1,073) | (636) | (764)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income - net |  |  |  |  |  |  |  |  | 845 | 793 | 498
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 1,801 | 1,777 | 1,441
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,712) | 354 | 299
Net income (loss) |  |  |  |  |  |  |  |  | 3,513 | 1,423 | 1,142
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | (58) | 93 | 10
Net income (loss) attributable to NEE |  |  |  |  |  |  |  |  | 3,571 | 1,330 | 1,132
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 11,873 | 10,872 | 11,637
Operating expenses - net |  |  |  |  |  |  |  |  | (8,551) | (7,864) | (8,695)
Interest expense |  |  |  |  |  |  |  |  | (482) | (456) | (443)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (5,391) | (2,956) | (2,754)
Other income - net |  |  |  |  |  |  |  |  | 52 | 75 | 70
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (2,499) | (329) | (185)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,073 | 1,001 | 947
Net income (loss) |  |  |  |  |  |  |  |  | (3,572) | (1,330) | (1,132)
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to NEE |  |  |  |  |  |  |  |  | $ (3,572) | $ (1,330) | $ (1,132)

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