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Acquisitions (Details)
$ in Millions
1 Months Ended 10 Months Ended
Jan. 01, 2019
USD ($)
county
customer
mi
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 891   $ 3,488
NextEra Energy Capital Holdings, Inc. (Consolidated) [Member] | Term Loan Agreements [Member]        
Business Acquisition [Line Items]        
Borrowings   $ 4,500    
Gulf Power [Member]        
Business Acquisition [Line Items]        
Cash purchase price $ 4,470      
Business Combination, Working Capital Adjustment 104      
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt 1,300      
Assets assumed 5,300      
Property, plant and equipment 4,000      
Regulatory assets 490      
Assumed liabilities 3,500      
Regulatory liabilities 640      
Deferred income taxes 590      
Goodwill 2,600      
Operating right-of-use assets 248      
Lease liabilities $ 248      
Expected lease payments over the remaining terms of the operating leases       $ 260
Gulf Power [Member] | Gulf Power [Member]        
Business Acquisition [Line Items]        
Number of customers acquired (more than) | customer 460,000      
Number of counties in which entity operates | county 8      
Number of miles of power lines | mi 9,400      
Electric generating facility capacity (in megawatts) | MW 2,300      
Trans Bay Cable, LLC [Member] | Scenario, Forecast [Member]        
Business Acquisition [Line Items]        
Business combination, consideration transferred     $ 1,050