Summarized Financial Information of NEECH (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Consolidating Statements of Income
Operating revenues	$ 3,863	$ 3,972	[1]
Operating expenses - net	(2,816)	(1,610)	[1]
Interest expense	(226)	(360)	[1]
Equity in earnings of subsidiaries	0	0
Gain on NEP deconsolidation	3,935	0
Other income - net	324	264
INCOME BEFORE INCOME TAXES	5,080	2,266	[1]
Income tax expense (benefit)	1,249	675	[1]
Net Income (Loss)	3,831	1,591	[1],[2]
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(597)	8	[1]
Net income (loss) attributable to NEE	4,428	1,583	[1]
Comprehensive income (loss) attributable to NEE	4,467	1,613
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0
Operating expenses - net	(56)	(49)
Interest expense	(1)	0
Equity in earnings of subsidiaries	4,361	1,563
Gain on NEP deconsolidation	0	0
Other income - net	51	43
INCOME BEFORE INCOME TAXES	4,355	1,557
Income tax expense (benefit)	(73)	(26)
Net Income (Loss)	4,428	1,583
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net income (loss) attributable to NEE	4,428	1,583
Comprehensive income (loss) attributable to NEE	4,467	1,613
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,277	1,462
Operating expenses - net	(878)	150
Interest expense	(91)	(241)
Equity in earnings of subsidiaries	0	0
Gain on NEP deconsolidation	3,935	0
Other income - net	250	229
INCOME BEFORE INCOME TAXES	4,493	1,600
Income tax expense (benefit)	1,210	450
Net Income (Loss)	3,283	1,150
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	597	(8)
Net income (loss) attributable to NEE	3,880	1,142
Comprehensive income (loss) attributable to NEE	3,921	1,175
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,586	2,510
Operating expenses - net	(1,882)	(1,711)
Interest expense	(134)	(119)
Equity in earnings of subsidiaries	(4,361)	(1,563)
Gain on NEP deconsolidation	0	0
Other income - net	23	(8)
INCOME BEFORE INCOME TAXES	(3,768)	(891)
Income tax expense (benefit)	112	251
Net Income (Loss)	(3,880)	(1,142)
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
Net income (loss) attributable to NEE	(3,880)	(1,142)
Comprehensive income (loss) attributable to NEE	$ (3,921)	$ (1,175)

[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 10 - Restricted Cash.