Common Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income attributable to NEE	$ 636	$ 650
Denominator:
Weighted-average number of common shares outstanding - basic	460.5	442.3
Equity units, performance share awards, options, forward sale agreement and restricted stock	2.4	6.5
Weighted-average number of common shares outstanding - assuming dilution	462.9	448.8
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 1.38	$ 1.47
Assuming dilution (in dollars per share)	$ 1.37	$ 1.45
Antidilutive securities (in shares)	0.2	0.1