Summarized Financial Information of NEECH (Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
NEECH a 100% owned subsidiary of NEE	100.00%
Condensed Consolidating Statements of Income
Operating revenues	$ 4,075	$ 3,857	[1]
Operating expenses - net	(2,940)	(2,798)	[1]
Interest expense	(714)	(226)	[1]
Equity in earnings of subsidiaries	0	0
Equity in earnings of equity method investees	16	197	[1],[2]
Gain on NEP deconsolidation	0	3,927	[1],[2]
Other income - net	243	127
INCOME BEFORE INCOME TAXES	680	5,084	[1]
Income tax expense (benefit)	74	1,250	[1]
Net Income (Loss)	606	3,834	[2],[3]
Net income (loss) attributable to noncontrolling interest	74	597	[1]
Net Income (Loss) Attributable to Parent	680	4,431	[1]
Comprehensive income (loss) attributable to NEE	656	4,470	[3]
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0
Operating expenses - net	(57)	(56)
Interest expense	0	(1)
Equity in earnings of subsidiaries	694	4,364
Equity in earnings of equity method investees	0	0
Gain on NEP deconsolidation	0	0
Other income - net	51	51
INCOME BEFORE INCOME TAXES	688	4,358
Income tax expense (benefit)	8	(73)
Net Income (Loss)	680	4,431
Net income (loss) attributable to noncontrolling interest	0	0
Net Income (Loss) Attributable to Parent	680	4,431
Comprehensive income (loss) attributable to NEE	656	4,470
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,167	1,271
Operating expenses - net	(875)	(859)
Interest expense	(561)	(92)
Equity in earnings of subsidiaries	0	0
Equity in earnings of equity method investees	16	197
Gain on NEP deconsolidation	0	3,927
Other income - net	166	53
INCOME BEFORE INCOME TAXES	(87)	4,497
Income tax expense (benefit)	(94)	1,211
Net Income (Loss)	7	3,286
Net income (loss) attributable to noncontrolling interest	74	597
Net Income (Loss) Attributable to Parent	81	3,883
Comprehensive income (loss) attributable to NEE	110	3,924
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,908	2,586
Operating expenses - net	(2,008)	(1,883)
Interest expense	(153)	(133)
Equity in earnings of subsidiaries	(694)	(4,364)
Equity in earnings of equity method investees	0	0
Gain on NEP deconsolidation	0	0
Other income - net	26	23
INCOME BEFORE INCOME TAXES	79	(3,771)
Income tax expense (benefit)	160	112
Net Income (Loss)	(81)	(3,883)
Net income (loss) attributable to noncontrolling interest	0	0
Net Income (Loss) Attributable to Parent	(81)	(3,883)
Comprehensive income (loss) attributable to NEE	$ (110)	$ (3,924)

[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.

[2] Amounts have been retrospectively adjusted for an accounting standards update related to leases.

[3] Amounts have been retrospectively adjusted for an accounting standards update related to leases.