Common Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income (loss) attributable to NEE	$ 716	$ 492	$ 1,366	$ 921
Denominator:
Weighted-average number of common shares outstanding - basic	445.5	434.1	443.9	433.8
Equity units, performance share awards, options, forward sale agreement and restricted stock	3.7	6.0	5.1	5.5
Weighted-average number of common shares outstanding - assuming dilution	449.2	440.1	449.0	439.3
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 1.61	$ 1.13	$ 3.08	$ 2.12
Assuming dilution (in dollars per share)	$ 1.59	$ 1.12	$ 3.04	$ 2.10
Antidilutive securities (in shares)	5.5	0.2	2.8	0.2