Variable Interest Entities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) equity_investment electric_generation_facility variable_interest_entity MW shares	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Assets	$ 12,321	$ 12,256
Liabilities	$ 6,042	5,190
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	$ 10	11
Noncurrent liabilities	$ 29	7
Differential Membership Interests [Member]
Variable Interest Entity [Line Items]
Number of entities consolidated | variable_interest_entity	12
Number of investments | electric_generation_facility	20
Differential Membership Interests [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 4,768	4,814
Liabilities	$ 112	122
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
NEP Subsidiaries [Member] | Noncontrolling Class B interests [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of entities consolidated | variable_interest_entity	4
Assets	$ 7,876	7,900
Liabilities	$ 1,584	1,448
Rosmar, Silver State and Meade [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of entities consolidated | variable_interest_entity	3
Other Acquisitions [Member] | Differential Membership And Noncontrolling Class B Interests [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 2,106	2,122
Liabilities	$ 51	$ 53
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Limited partner interest percentage	39.20%
Noncontrolling limited partner interest percentage	60.80%