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Acquisitions (Details)
$ in Millions
Oct. 27, 2022
USD ($)
numberOfProjects
Mar. 31, 2021
USD ($)
state
utlity
mi
Dec. 31, 2022
USD ($)
county
Dec. 31, 2021
USD ($)
Jan. 01, 2021
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 4,854 $ 4,844  
Gulf Power [Member]          
Business Acquisition [Line Items]          
Debt assumed         $ 1,800
Assets assumed         6,700
Property, plant, and equipment         4,900
Regulatory assets         1,200
Assumed liabilities         3,900
Regulatory liabilities         566
Deferred income taxes         729
GridLiance [Member]          
Business Acquisition [Line Items]          
Assets assumed   $ 384      
Assumed liabilities   210      
Goodwill   592      
Goodwill, expected tax deductible amount   586      
Cash consideration   502      
Business combination, assumption of debt   175      
Contingent consideration, liability   $ 264      
FPL [Member]          
Business Acquisition [Line Items]          
Number of counties In which entity operates | county     8    
Goodwill     $ 2,989 2,989  
FPL [Member] | Gulf Power [Member]          
Business Acquisition [Line Items]          
Goodwill         $ 2,700
GridLiance Holdco, LP and GridLiance GP, LLC | GridLiance [Member]          
Business Acquisition [Line Items]          
Length of power lines (mi) | mi   700      
Number Of FERC-Regulated Transmission Utilities | utlity   3      
Number of States in which Entity Operates | state   6      
GridLiance Holdco, LP and GridLiance GP, LLC | GridLiance [Member] | Midwest And Nevada [Member]          
Business Acquisition [Line Items]          
Number of States in which Entity Operates | state   5      
NEER [Member] | GridLiance [Member]          
Business Acquisition [Line Items]          
Contingent consideration, liability     $ 203 $ 261  
NEER [Member] | RNG Acquisition          
Business Acquisition [Line Items]          
Cash consideration $ 1,100        
Business combination, assumption of debt $ 37        
Membership interests acquired 100.00%        
Number of RNG projects | numberOfProjects 31        
Number Of RNG Projects, Renewable Gas Facility | numberOfProjects 1