Variable Interest Entities (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) variable_interest_entity equity_investment electric_generation_facility MW shares	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Assets	$ 12,332	$ 12,256
Liabilities	5,609	5,190
Non-current assets	11,852	11,823
Non-current liabilities	$ 5,246	4,889
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%
Non-current assets	$ 10	11
Non-current liabilities	$ 21	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	$ 4,699	4,814
Liabilities	$ 127	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	$ 7,770	7,900
Liabilities	$ 1,586	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	$ 2,073	2,122
Liabilities	$ 56	$ 53
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Limited partner interest percentage	41.80%
Noncontrolling limited partner interest percentage	58.20%