Common Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jan. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities (in shares)	11.2		8.1	3.9	4.6
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income (loss) attributable to NEE	$ 753		$ 879	$ 1,946	$ 2,245
Denominator:
Weighted-average number of common shares outstanding - basic	463.3		454.1	461.7	447.3
Equity units, performance share awards, options, forward sale agreement and restricted stock	2.7		1.9	3.0	4.0
Weighted-average number of common shares outstanding - assuming dilution	466.0		456.0	464.7	451.3
Earnings per share attributable to NEE:
Basic (in dollars per share)	$ 1.63		$ 1.94	$ 4.21	$ 5.02
Assuming dilution (in dollars per share)	$ 1.62		$ 1.93	$ 4.19	$ 4.97
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	$ 3			$ 27
Impact of Restatement on Income, Net of Tax		$ 17
Impact of Restatement on Earnings Per Share, Basic and Diluted		$ 0.04