Summarized Financial Information of Capital Holdings (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Condensed Consolidating Statements of Income
Operating revenues	$ 3,817		$ 4,358	$ 7,651		$ 8,463
Operating expenses	(2,648)		(3,212)	(5,248)		(6,187)
Interest expense	(602)		(280)	(1,111)		(601)
Equity in earnings of subsidiaries	0		0	0		0
Other income - net	196		128	367		256
INCOME BEFORE INCOME TAXES	763		994	1,659		1,931
Income tax expense (benefit)	219	[1]	274	461	[1]	560
Net Income (Loss)	544	[1]	720	1,198	[1]	1,371
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4		4	5		5
Net Income (Loss) Attributable to Parent	540		716	1,193		1,366
Comprehensive income (loss) attributable to NEE	571		785	1,278		1,402
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0		0	0		0
Operating expenses	(5)		(5)	(10)		(9)
Interest expense	0		(1)	(1)		(2)
Equity in earnings of subsidiaries	586		716	1,224		1,361
Other income - net	0		0	1		1
INCOME BEFORE INCOME TAXES	581		710	1,214		1,351
Income tax expense (benefit)	41		(6)	21		(15)
Net Income (Loss)	540		716	1,193		1,366
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0		0	0		0
Net Income (Loss) Attributable to Parent	540		716	1,193		1,366
Comprehensive income (loss) attributable to NEE	571		785			1,402
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,070		1,366	2,605		2,932
Operating expenses	(720)		(984)	(1,725)		(2,078)
Interest expense	(485)		(167)	(882)		(372)
Equity in earnings of subsidiaries	0		0	0		0
Other income - net	180		111	327		227
INCOME BEFORE INCOME TAXES	45		326	325		709
Income tax expense (benefit)	(100)		33	(70)		125
Net Income (Loss)	145		293	395		584
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	4		4	5		5
Net Income (Loss) Attributable to Parent	141		289	390		579
Comprehensive income (loss) attributable to NEE	172		358	482		631
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,747		2,992	5,046		5,531
Operating expenses	(1,923)		(2,223)	(3,513)		(4,100)
Interest expense	(117)		(112)	(228)		(227)
Equity in earnings of subsidiaries	(586)		(716)	(1,224)		(1,361)
Other income - net	16		17	39		28
INCOME BEFORE INCOME TAXES	137		(42)	120		(129)
Income tax expense (benefit)	278		247	510		450
Net Income (Loss)	(141)		(289)	(390)		(579)
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0		0	0		0
Net Income (Loss) Attributable to Parent	(141)		(289)	(390)		(579)
Comprehensive income (loss) attributable to NEE	$ (172)		$ (358)	$ (482)		$ (631)

[1] Reflects the adoption in the second quarter of 2016 of an accounting standards update. See Note 6 - Stock-Based Compensation.