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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Concentration Risk [Line Items]      
Revenue from contracts with customers $ 3,800 $ 3,600  
FPL [Member]      
Concentration Risk [Line Items]      
Revenue from contracts with customers 2,600 $ 2,600  
Unbilled revenues 442   $ 432
NextEra Energy Resources [Member]      
Concentration Risk [Line Items]      
Revenue, remaining performance obligation $ 890    
Sales Revenue, Net [Member] | FPL [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage 90.00%