Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income attributable to NEE - basic	$ 447	$ 1,229	$ 2,369	$ 2,924
Adjustment for the impact of dilutive securities at NEP(a)	0	(1)	0	0
Net income attributable to NEE – assuming dilution	$ 447	$ 1,228	$ 2,369	$ 2,924
Denominator:
Weighted-average number of common shares outstanding – basic	1,962.7	1,959.4	1,962.2	1,958.4
Equity units, stock options, performance share awards and restricted stock	10.2	9.5	9.1	9.3
Weighted-average number of common shares outstanding – assuming dilution	1,972.9	1,968.9	1,971.3	1,967.7
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 0.23	$ 0.63	$ 1.21	$ 1.49
Assuming dilution (in dollars per share)	$ 0.23	$ 0.62	$ 1.20	$ 1.49