Summarized Financial Information of Capital Holdings (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Consolidating Statements of Income
Operating revenues	$ 3,835	$ 4,104
Operating expenses	(2,601)	(2,975)
Interest expense	(509)	(321)
Equity in earnings of subsidiaries	0	0
Other income - net	171	128
INCOME BEFORE INCOME TAXES	896	936
Income tax expense (benefit)	259	286
Net Income (Loss)	637	650
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1)	0
Net Income (Loss) Attributable to Parent	636	650
Comprehensive income (loss) attributable to NEE	690	617
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0
Operating expenses	(4)	(4)
Interest expense	0	(1)
Equity in earnings of subsidiaries	638	645
Other income - net	0	0
INCOME BEFORE INCOME TAXES	634	640
Income tax expense (benefit)	(2)	(10)
Net Income (Loss)	636	650
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net Income (Loss) Attributable to Parent	636	650
Comprehensive income (loss) attributable to NEE		617
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,535	1,567
Operating expenses	(1,005)	(1,095)
Interest expense	(397)	(205)
Equity in earnings of subsidiaries	0	0
Other income - net	147	117
INCOME BEFORE INCOME TAXES	280	384
Income tax expense (benefit)	30	93
Net Income (Loss)	250	291
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1	0
Net Income (Loss) Attributable to Parent	249	291
Comprehensive income (loss) attributable to NEE	310	274
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,300	2,537
Operating expenses	(1,592)	(1,876)
Interest expense	(112)	(115)
Equity in earnings of subsidiaries	(638)	(645)
Other income - net	24	11
INCOME BEFORE INCOME TAXES	(18)	(88)
Income tax expense (benefit)	231	203
Net Income (Loss)	(249)	(291)
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net Income (Loss) Attributable to Parent	(249)	(291)
Comprehensive income (loss) attributable to NEE	$ (310)	$ (274)