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Variable Interest Entities (Details) $ in Millions | Apr. 30, 2015 equity_investment shares | Mar. 31, 2018 USD ($) electric_generation_facility variable_interest_entity | Dec. 31, 2017 USD ($)
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Variable Interest Entity [Line Items] |  |  |  |
Number of entities consolidated | variable_interest_entity |  | 7 |  |
Number of wind electric generation facilities owned and operated | electric_generation_facility |  | 10 |  |
Property, plant and equipment - net |  | $ 5,239 | $ 6,197 | [1]
Deferral related to differential membership interests |  | $ 0 | 1,442 | [1]
NEP OpCo [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Limited partner interest percentage |  | 34.90% |  |
Noncontrolling limited partner interest percentage |  | 65.10% |  |
NextEra Energy Operating Partners, LP [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership interests percentage | 50.00% |  |  |
Class B Units, Series 1 [Member] | NextEra Energy Partners, LP [Member] | NextEra Energy Operating Partners, LP [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of units issued (in units) | shares | 1,000,000 |  |  |
Class B Units, Series 2 [Member] | NextEra Energy Partners, LP [Member] | NextEra Energy Operating Partners, LP [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of units issued (in units) | shares | 1,000,000 |  |  |
Palo Duro WInd Project Holdings, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Property, plant and equipment - net |  | $ 2,816 | 2,840 |
Deferral related to differential membership interests |  | $ 68 | $ 1,515 |
Adelanto I, Adelanto II and McCoy [Member] | Subsidiaries [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of investments | equity_investment | 3 |  |  |
Economic rights percentage | 100.00% |  |  |
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