Summarized Financial Information of Capital Holdings (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Consolidating Statements of Income
Operating revenues	$ 4,404	$ 3,817	$ 8,377	$ 7,651
Operating expenses - net	(3,119)	(2,648)	(4,687)	(5,248)
Interest expense	(430)	(602)	(790)	(1,111)
Equity in earnings of subsidiaries	0	0	0	0
Other income - net	238	196	459	367
INCOME BEFORE INCOME TAXES	1,093	763	3,359	1,659
Income tax expense (benefit)	289	219	964	461
Net Income (Loss)	804	544	2,395	1,198
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	11	4	19	5
Net income (loss) attributable to NEE	793	540	2,376	1,193
Comprehensive income (loss) attributable to NEE	836	571	2,449	1,278
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	3,077	2,747	5,588	5,046
Operating expenses - net	(2,141)	(1,923)	(3,854)	(3,513)
Interest expense	(120)	(117)	(240)	(228)
Equity in earnings of subsidiaries	(787)	(586)	(2,349)	(1,224)
Other income - net	19	16	12	39
INCOME BEFORE INCOME TAXES	48	137	(843)	120
Income tax expense (benefit)	312	278	563	510
Net Income (Loss)	(264)	(141)	(1,406)	(390)
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0	0	0
Net income (loss) attributable to NEE	(264)	(141)	(1,406)	(390)
Comprehensive income (loss) attributable to NEE	(297)	(172)	(1,472)	(482)
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0	0	0
Operating expenses - net	(4)	(5)	(10)	(10)
Interest expense	(1)	0	(1)	(1)
Equity in earnings of subsidiaries	787	586	2,349	1,224
Other income - net	0	0	1	1
INCOME BEFORE INCOME TAXES	782	581	2,339	1,214
Income tax expense (benefit)	(11)	41	(37)	21
Net Income (Loss)	793	540	2,376	1,193
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0	0	0
Net income (loss) attributable to NEE	793	540	2,376	1,193
Comprehensive income (loss) attributable to NEE	836	571	2,449	1,278
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,327	1,070	2,789	2,605
Operating expenses - net	(974)	(720)	(823)	(1,725)
Interest expense	(309)	(485)	(549)	(882)
Equity in earnings of subsidiaries	0	0	0	0
Other income - net	219	180	446	327
INCOME BEFORE INCOME TAXES	263	45	1,863	325
Income tax expense (benefit)	(12)	(100)	438	(70)
Net Income (Loss)	275	145	1,425	395
LESS NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	11	4	19	5
Net income (loss) attributable to NEE	264	141	1,406	390
Comprehensive income (loss) attributable to NEE	$ 297	$ 172	$ 1,472	$ 482