Summarized Financial Information of NEECH (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 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	$ 4,418	$ 4,808	[1]	$ 12,351	$ 13,185	[1]
Operating expenses - net	(3,448)	(3,457)	[1]	(9,172)	(8,196)	[1]
Interest expense	(167)	(381)	[1]	(787)	(1,171)	[1]
Equity in earnings of subsidiaries	0	0		0	0
Equity in earnings of equity method investees	122	56	[1]	372	153	[1]
Gain on NEP deconsolidation	0	0	[1]	3,935	0	[1],[2]
Other income - net	144	194		381	610
INCOME BEFORE INCOME TAXES	1,069	1,220	[1]	7,080	4,581	[1]
Income tax expense (benefit)	126	364	[1]	1,605	1,329	[1]
Net Income (Loss)	943	856	[1]	5,475	3,252	[1],[2]
Net income (loss) attributable to noncontrolling interest	64	(9)	[1]	754	(29)	[1]
NET INCOME	1,007	847	[1]	6,229	3,223	[1]
Comprehensive income (loss) attributable to NEE	1,022	892		6,288	3,341
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0		0	0
Operating expenses - net	(46)	(51)		(159)	(114)
Interest expense	(5)	(1)		(16)	(2)
Equity in earnings of subsidiaries	963	830		6,132	3,179
Equity in earnings of equity method investees				0	0
Gain on NEP deconsolidation				0	0
Other income - net	37	48		138	102
INCOME BEFORE INCOME TAXES	949	826		6,095	3,165
Income tax expense (benefit)	(58)	(21)		(134)	(58)
Net Income (Loss)	1,007	847		6,229	3,223
Net income (loss) attributable to noncontrolling interest	0	0		0	0
NET INCOME	1,007	847		6,229	3,223
Comprehensive income (loss) attributable to NEE	1,022	892		6,288	3,341
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,054	1,365		3,526	4,154
Operating expenses - net	(941)	(982)		(2,715)	(1,806)
Interest expense	(26)	(259)		(360)	(809)
Equity in earnings of subsidiaries	0	0		0	0
Equity in earnings of equity method investees				372	153
Gain on NEP deconsolidation				3,935	0
Other income - net	82	125		174	477
INCOME BEFORE INCOME TAXES	291	305		4,932	2,169
Income tax expense (benefit)	52	30		1,319	468
Net Income (Loss)	239	275		3,613	1,701
Net income (loss) attributable to noncontrolling interest	64	(9)		754	(29)
NET INCOME	303	266		4,367	1,672
Comprehensive income (loss) attributable to NEE	319	312		4,430	1,784
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	3,364	3,443		8,825	9,031
Operating expenses - net	(2,461)	(2,424)		(6,298)	(6,276)
Interest expense	(136)	(121)		(411)	(360)
Equity in earnings of subsidiaries	(963)	(830)		(6,132)	(3,179)
Equity in earnings of equity method investees				0	0
Gain on NEP deconsolidation				0	0
Other income - net	25	21		69	31
INCOME BEFORE INCOME TAXES	(171)	89		(3,947)	(753)
Income tax expense (benefit)	132	355		420	919
Net Income (Loss)	(303)	(266)		(4,367)	(1,672)
Net income (loss) attributable to noncontrolling interest	0	0		0	0
NET INCOME	(303)	(266)		(4,367)	(1,672)
Comprehensive income (loss) attributable to NEE	$ (319)	$ (312)		$ (4,430)	$ (1,784)

[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.