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Variable Interest Entities (Details) $ in Millions	Apr. 30, 2015 equity_investment shares	Mar. 31, 2018 USD ($) electric_generation_facility variable_interest_entity	Dec. 31, 2017 USD ($)
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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Liabilities, Deferral Related to Differential Membership Interest, Variable Interest Entity, Noncurrent

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Variable Interest Entities, Number of Wind Electric Generation Facilities Owned and Operated

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