Variable Interest Entities (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) variable_interest_entity electric_generation_facility equity_investment MW shares	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Number of entities consolidated | variable_interest_entity	12
Number of wind electric generation facilities owned and operated | electric_generation_facility	20
Subsidiaries [Member]
Variable Interest Entity [Line Items]
Number of investments | equity_investment	3
Generation facility capacity (mw) | MW	277
Economic rights percentage	100.00%
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Ownership interests percentage	50.00%
Noncurrent assets	$ 11	$ 20
Noncurrent liabilities	$ 13
Class B Units, Series 1 [Member] | NextEra Energy Partners, LP [Member] | NEP OpCo [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] | NEP OpCo [Member]
Variable Interest Entity [Line Items]
Number of units issued (in units) | shares	1,000,000
VIEs Wind And Solar [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 4,850	4,937
Liabilities	120	132
NEP Renewables, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	2,281	2,339
Liabilities	$ 94	$ 89
NEP Renewables II, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of entities consolidated | variable_interest_entity	2
Assets	$ 2,207
Liabilities	$ 326
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Limited partner interest percentage	37.50%
Noncontrolling limited partner interest percentage	62.50%