Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income (loss) attributable to NEE	$ 793	$ 540	$ 2,376	$ 1,193
Denominator:
Weighted-average number of common shares outstanding - basic	467.9	461.3	467.7	460.9
Equity units, stock options, performance share awards, forward sale agreements and restricted stock	3.8	3.3	3.3	3.1
Weighted-average number of common shares outstanding - assuming dilution	471.7	464.6	471.0	464.0
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 1.69	$ 1.17	$ 5.08	$ 2.59
Assuming dilution (in dollars per share)	$ 1.68	$ 1.16	$ 5.05	$ 2.57
Antidilutive securities (in shares)	0.4	0.3	6.2	0.2