Common Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jan. 01, 2016
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income (loss) attributable to NEE	$ 540		$ 716	$ 1,193	$ 1,366
Denominator:
Weighted-average number of common shares outstanding - basic	461.3		445.5	460.9	443.9
Equity units, performance share awards, options, forward sale agreement and restricted stock	3.3		3.7	3.1	5.1
Weighted-average number of common shares outstanding - assuming dilution	464.6		449.2	464.0	449.0
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 1.17		$ 1.61	$ 2.59	$ 3.08
Assuming dilution (in dollars per share)	$ 1.16		$ 1.59	$ 2.57	$ 3.04
Antidilutive securities (in shares)	0.3		5.5	0.2	2.8
Adjustments for New Accounting Principle, Early Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to unrecognized tax benefits						$ 18
Excess Tax Benefits	$ 7			$ 24
Impact of Restatement on Income, Net of Tax		$ 17
Impact of Restatement on Earnings Per Share, Basic and Diluted		$ 0.04