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Acquisitions (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 29, 2020
utlity
state
mi
Business Acquisition [Line Items]        
Carrying amount of assets, consolidated variable interest entity $ 132,441   $ 127,684  
Goodwill 4,853   $ 4,254  
FPL        
Business Acquisition [Line Items]        
Carrying amount of assets, consolidated variable interest entity   $ 6,700    
Property, plant and equipment   4,900    
Regulatory assets   1,200    
Assumed liabilities   3,900    
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt   1,800    
Deferred income taxes   729    
Regulatory liabilities   566    
Goodwill   $ 2,700    
GridLiance [Member] | NextEra Energy Transmission, LLC Subsidiary [Member]        
Business Acquisition [Line Items]        
Assumed liabilities 222      
Goodwill 599      
Number of FERC-r transmission utilities | utlity       3
Number of miles of power lines | mi       700
Number of states in which entity operates | state       6
Debt assumed 175      
Assets assumed 389      
Goodwill, Expected Tax Deductible Amount 597      
Contingent consideration liabilities 264      
Cash purchase price $ 502      
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