Summarized Financial Information of Capital Holdings (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidating Statements of Income
Operating revenues	$ 4,805	$ 4,954	$ 12,457	$ 13,417
Operating expenses	(3,526)	(3,473)	(8,775)	(9,660)
Interest expense	(369)	(311)	(1,480)	(912)
Equity in earnings of subsidiaries	0	0	0	0
Other income - net	297	132	665	388
INCOME BEFORE INCOME TAXES	1,207	1,302	2,867	3,233
Income tax expense (benefit)	418	421	879	981
Net Income (Loss)	789	881	1,988	2,252
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	36	2	42	7
Net Income (Loss) Attributable to Parent	753	879	1,946	2,245
Comprehensive income (loss) attributable to NEE	799	714	2,078	2,117
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0	0	0
Operating expenses	(5)	(3)	(14)	(12)
Interest expense	0	(1)	(1)	(3)
Equity in earnings of subsidiaries	765	865	1,989	2,226
Other income - net	4	0	5	0
INCOME BEFORE INCOME TAXES	764	861	1,979	2,211
Income tax expense (benefit)	11	(18)	33	(34)
Net Income (Loss)	753	879	1,946	2,245
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0	0	0
Net Income (Loss) Attributable to Parent	753	879	1,946	2,245
Comprehensive income (loss) attributable to NEE	799	714	2,078	2,117
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,526	1,683	4,131	4,616
Operating expenses	(1,032)	(1,045)	(2,756)	(3,124)
Interest expense	(255)	(200)	(1,137)	(573)
Equity in earnings of subsidiaries	0	0	0	0
Other income - net	276	114	603	343
INCOME BEFORE INCOME TAXES	515	552	841	1,262
Income tax expense (benefit)	141	167	71	293
Net Income (Loss)	374	385	770	969
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	36	2	42	7
Net Income (Loss) Attributable to Parent	338	383	728	962
Comprehensive income (loss) attributable to NEE	384	218	866	850
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	3,279	3,271	8,326	8,801
Operating expenses	(2,489)	(2,425)	(6,005)	(6,524)
Interest expense	(114)	(110)	(342)	(336)
Equity in earnings of subsidiaries	(765)	(865)	(1,989)	(2,226)
Other income - net	17	18	57	45
INCOME BEFORE INCOME TAXES	(72)	(111)	47	(240)
Income tax expense (benefit)	266	272	775	722
Net Income (Loss)	(338)	(383)	(728)	(962)
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0	0	0
Net Income (Loss) Attributable to Parent	(338)	(383)	(728)	(962)
Comprehensive income (loss) attributable to NEE	$ (384)	$ (218)	$ (866)	$ (850)