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Summarized Financial Information of NEECH - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | $ 3,789 | $ 6,667 | $ 5,561
Reportable Legal Entities [Member] | NEE (Guarantor) [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | 3,789 | 6,667 | 5,561
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | 1,350 | 4,434 | 3,710
Consolidation, Eliminations [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Comprehensive income (loss) attributable to NEE | $ (1,340) | $ (4,434) | $ (3,710)

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