Summarized Financial Information of NEECH (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Condensed Income Statements, Captions [Line Items]
NEECH a 100% owned subsidiary of NEE	100.00%			100.00%
Condensed Consolidating Statements of Income
Operating revenues	$ 4,069	$ 4,404	[1]	$ 7,932	$ 8,377	[1]
Operating expenses - net	(2,907)	(3,128)	[1]	(5,723)	(4,739)	[1]
Interest expense	(394)	(430)	[1]	(620)	(790)	[1]
Equity in earnings of subsidiaries	0	0		0	0
Gain on NEP deconsolidation	0	0	[1]	3,935	0	[1],[2]
Other income - net	163	247		487	511
INCOME BEFORE INCOME TAXES	931	1,093	[1]	6,011	3,359	[1]
Income tax expense (benefit)	230	289	[1]	1,479	964	[1]
Net Income (Loss)	701	804	[1]	4,532	2,395	[1],[2]
Net income (loss) attributable to noncontrolling interest	(94)	11	[1]	(691)	19	[1]
NET INCOME	795	793	[1]	5,223	2,376	[1]
Comprehensive income (loss) attributable to NEE	800	836		5,267	2,449
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0		0	0
Operating expenses - net	(58)	(13)		(113)	(62)
Interest expense	10	1		(11)	(1)
Equity in earnings of subsidiaries	808	787		5,169	2,349
Gain on NEP deconsolidation				0	0
Other income - net	52	9		102	53
INCOME BEFORE INCOME TAXES	792	782		5,147	2,339
Income tax expense (benefit)	(3)	(11)		(76)	(37)
Net Income (Loss)	795	793		5,223	2,376
Net income (loss) attributable to noncontrolling interest	0	0		0	0
NET INCOME	795	793		5,223	2,376
Comprehensive income (loss) attributable to NEE	800	836		5,267	2,449
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,195	1,327		2,472	2,789
Operating expenses - net	(896)	(974)		(1,773)	(823)
Interest expense	243	309		(334)	(549)
Equity in earnings of subsidiaries	0	0		0	0
Gain on NEP deconsolidation				3,935	0
Other income - net	91	219		340	446
INCOME BEFORE INCOME TAXES	147	263		4,640	1,863
Income tax expense (benefit)	57	(12)		1,267	438
Net Income (Loss)	90	275		3,373	1,425
Net income (loss) attributable to noncontrolling interest	94	(11)		691	(19)
NET INCOME	184	264		4,064	1,406
Comprehensive income (loss) attributable to NEE	190	297		4,111	1,472
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,874	3,077		5,460	5,588
Operating expenses - net	(1,953)	(2,141)		(3,837)	(3,854)
Interest expense	(141)	(120)		(275)	(240)
Equity in earnings of subsidiaries	(808)	(787)		(5,169)	(2,349)
Gain on NEP deconsolidation				0	0
Other income - net	20	19		45	12
INCOME BEFORE INCOME TAXES	(8)	48		(3,776)	(843)
Income tax expense (benefit)	176	312		288	563
Net Income (Loss)	(184)	(264)		(4,064)	(1,406)
Net income (loss) attributable to noncontrolling interest	0	0		0	0
NET INCOME	(184)	(264)		(4,064)	(1,406)
Comprehensive income (loss) attributable to NEE	$ (190)	$ (297)		$ (4,111)	$ (1,472)

[1] Prior period amounts have been retrospectively adjusted as discussed in Note 3 - Amendments to Presentation of Retirement Benefits.

[2] Prior period amounts have been retrospectively adjusted as discussed in Note 11 - Restricted Cash.