Summarized Financial Information of Capital Holdings (Statement of Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidating Statements of Income
Operating revenues	$ 4,104	$ 3,674
Operating expenses	(2,975)	(2,936)
Interest expense	(321)	(319)
Equity in earnings of subsidiaries	0	0
Other income - net	128	164
INCOME BEFORE INCOME TAXES	936	583
Income tax expense (benefit)	286	153
Net Income (Loss)	650	430
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net Income (Loss) Attributable to Parent	650	430
Comprehensive income (loss) attributable to NEE	617	395
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0
Operating expenses	(4)	(4)
Interest expense	(1)	(2)
Equity in earnings of subsidiaries	645	435
Other income - net	0	1
INCOME BEFORE INCOME TAXES	640	430
Income tax expense (benefit)	(10)	0
Net Income (Loss)	650	430
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net Income (Loss) Attributable to Parent	650	430
Comprehensive income (loss) attributable to NEE		395
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,567	1,142
Operating expenses	(1,095)	(1,032)
Interest expense	(205)	(216)
Equity in earnings of subsidiaries	0	0
Other income - net	117	148
INCOME BEFORE INCOME TAXES	384	42
Income tax expense (benefit)	93	(46)
Net Income (Loss)	291	88
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net Income (Loss) Attributable to Parent	291	88
Comprehensive income (loss) attributable to NEE	274	48
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,537	2,532
Operating expenses	(1,876)	(1,900)
Interest expense	(115)	(101)
Equity in earnings of subsidiaries	(645)	(435)
Other income - net	11	15
INCOME BEFORE INCOME TAXES	(88)	111
Income tax expense (benefit)	203	199
Net Income (Loss)	(291)	(88)
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net Income (Loss) Attributable to Parent	(291)	(88)
Comprehensive income (loss) attributable to NEE	$ (274)	$ (48)