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Acquisitions (Details)
$ in Millions
1 Months Ended
Sep. 29, 2020
USD ($)
utlity
state
mi
Jul. 16, 2019
USD ($)
mi
Jan. 01, 2019
USD ($)
county
customer
mi
MW
Dec. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]            
Goodwill         $ 4,214 $ 4,204
NextEra Energy Capital Holdings, Inc. (Consolidated) [Member] | Term Loan Agreements [Member]            
Business Acquisition [Line Items]            
Borrowings       $ 4,500    
Trans Bay Cable, LLC [Member]            
Business Acquisition [Line Items]            
Number of miles of power lines | mi   53        
Gulf Power [Member]            
Business Acquisition [Line Items]            
Cash purchase price     $ 4,440      
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt     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      
Gulf Power [Member] | Gulf Power [Member]            
Business Acquisition [Line Items]            
Number of customers acquired (more than) | customer     470,000      
Number of counties in which entity operates | county     8      
Number of miles of power lines | mi     9,500      
Electric generating facility capacity (in megawatts) | MW     2,300      
Trans Bay Cable, LLC [Member]            
Business Acquisition [Line Items]            
Assets assumed   $ 703        
Assumed liabilities   643        
Goodwill   610        
Goodwill, Expected Tax Deductible Amount         $ 572  
Trans Bay Cable, LLC [Member] | NextEra Energy Transmission, LLC Subsidiary [Member]            
Business Acquisition [Line Items]            
Cash purchase price   670        
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt   $ 422        
GridLiance [Member] | NextEra Energy Transmission, LLC Subsidiary [Member]            
Business Acquisition [Line Items]            
Number of miles of power lines | mi 700          
Consideration transferred $ 660          
Debt assumed $ 160          
Number of FERC-r transmission utilities | utlity 3          
Number of states in which entity operates | state 6          
GridLiance [Member] | NextEra Energy Transmission, LLC Subsidiary [Member] | Midwest And Nevada [Member]            
Business Acquisition [Line Items]            
Number of states in which entity operates | state 5