Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 4,900	$ 4,900	$ 12,900	$ 13,200
FPL [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,400	$ 3,500	8,800	$ 9,200
Unbilled revenues	468		468		$ 389
NextEra Energy Resources [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation	$ 870		$ 870
Revenue Benchmark [Member] | FPL [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage			90.00%