Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income (loss) attributable to NEE	$ 1,275	$ 1,234	$ 1,695	$ 1,914
Dilutive Securities, Effect on Basic Earnings Per Share	(2)	0	0	0
Net income attributable to NEE - assuming dilution	$ 1,273	$ 1,234	$ 1,695	$ 1,914
Denominator:
Weighted-average number of common shares outstanding - basic	489.7	478.9	489.5	478.6
Equity units, stock options, performance share awards and restricted stock	2.1	3.9	2.3	3.7
Weighted-average number of common shares outstanding - assuming dilution	491.8	482.8	491.8	482.3
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 2.60	$ 2.58	$ 3.46	$ 4.00
Assuming dilution (in dollars per share)	$ 2.59	$ 2.56	$ 3.45	$ 3.97
Antidilutive securities (in shares)	9.5	0.5	7.8	0.4