Acquisitions (Details) $ in Millions				1 Months Ended	12 Months Ended
	Sep. 29, 2020 USD ($) state utlity mi	Jul. 16, 2019 USD ($) mi	Jan. 01, 2019 USD ($) customer county mi MW	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) customer mi MW	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($) county
Business Acquisition [Line Items]
Number of counties In which entity operates | county							8
Goodwill					$ 4,204		$ 4,254
Carrying amount of assets, consolidated variable interest entity				$ 103,702	117,691		127,684
Subsequent Event [Member]
Business Acquisition [Line Items]
Carrying amount of assets, consolidated variable interest entity						$ 6,700
Gulf Power [Member]
Business Acquisition [Line Items]
Cash consideration			$ 4,440
Debt assumed			1,300
Assets assumed			5,200
Property, plant, and equipment			4,000
Regulatory assets			494
Assumed liabilities			3,400
Regulatory liabilities			635
Deferred income taxes			$ 562
Goodwill							2,700
Trans Bay Cable, LLC [Member]
Business Acquisition [Line Items]
Cash consideration		$ 670
Debt assumed		422
Assets assumed		703
Assumed liabilities		$ 643
Goodwill							610
Goodwill, expected tax deductible amount							$ 572
Florida City Gas [Member]
Business Acquisition [Line Items]
Cash consideration					$ 530
Stanton Energy Center [Member]
Business Acquisition [Line Items]
Membership interests acquired					65.00%
Natural Gas Generation Facilities [Member]
Business Acquisition [Line Items]
Cash consideration					$ 200
FPL [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Debt assumed						1,800
Property, plant, and equipment						4,900
Regulatory assets						1,200
Assumed liabilities						3,900
Regulatory liabilities						566
Deferred income taxes						729
Goodwill						$ 2,700
Gulf Power [Member] | Gulf Power [Member]
Business Acquisition [Line Items]
Number of customers served | customer			470,000
Number of counties In which entity operates | county			8
Length of power lines (mi) | mi			9,500
Natural Gas And Or Oil Electric Generating Facility Capacity | MW			2,300
NextEra Energy Capital Holdings, Inc. (Consolidated) [Member] | Loans Payable [Member]
Business Acquisition [Line Items]
Proceeds from Short-term Debt				$ 4,500
Trans Bay Cable, LLC [Member]
Business Acquisition [Line Items]
Length of power lines (mi) | mi		53
Florida City Gas [Member] | Florida City Gas [Member]
Business Acquisition [Line Items]
Number of customers served | customer					110,000
Length Of Natural Gas Pipeline | mi					3,700
Oleader Power Project [Member] | Oleader Power Project [Member]
Business Acquisition [Line Items]
Membership interests acquired					100.00%
Natural-Gas Fired, Simple-Cycle Combustion Turbine Electric Generation Facility | MW					791
Entity That Owns Stanton Energy Center Unit A [Member] | Stanton Energy Center [Member]
Business Acquisition [Line Items]
Membership interests acquired					100.00%
Stanton Energy Center [Member] | Stanton Energy Center [Member]
Business Acquisition [Line Items]
Combined-cycle Electric Generation Facility | MW					660
NEET [Member] | GridLiance [Member]
Business Acquisition [Line Items]
Length of power lines (mi) | mi	700
Business Combination, Consideration Transferred	$ 660
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt	$ 160
Number Of FERC-Regulated Transmission Utilities | utlity	3
Number of States in which Entity Operates | state	6
NEET [Member] | GridLiance [Member] | Midwest And Nevada [Member]
Business Acquisition [Line Items]
Number of States in which Entity Operates | state	5