Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income (loss) attributable to NEE	$ 421	$ 680
Numerator - net income attributable to NEE(a)	$ 421	$ 680
Denominator:
Weighted-average number of common shares outstanding - basic	489.3	478.3
Equity units, stock options, performance share awards and restricted stock	2.4	3.5
Weighted-average number of common shares outstanding - assuming dilution	491.7	481.8
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 0.86	$ 1.42
Assuming dilution (in dollars per share)	$ 0.86	$ 1.41
Antidilutive securities (in shares)	6.2	0.5