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Summarized Financial Information of NEECH - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | $ 5,559 | $ 3,009 | $ 2,625
Reportable Legal Entities [Member] | NEE (Guarantor) [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | 5,559 | 3,009 | 2,625
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | 3,708 | 1,448 | 1,049
Consolidation, Eliminations [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | $ (3,708) | $ (1,448) | $ (1,049)

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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