Summarized Financial Information of NEECH - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Operating revenues	$ 4,390	$ 4,416	$ 4,063	$ 3,857	$ 4,004	$ 4,803	$ 4,399	$ 3,967	$ 16,727	$ 17,173	[1]	$ 16,138	[1]
Operating expenses - net									(12,447)	(12,000)	[1]	(11,679)	[1]
Interest expense									(1,498)	(1,558)	[1]	(1,098)	[1]
Equity in earnings of subsidiaries									0	0		0
Equity in earnings of equity method investees									358	141	[1],[2]	148	[1],[2]
Gain on NEP deconsolidation									3,927	0	[1],[2]	0	[1],[2]
Other income - net									285	907		869
Income (loss) before income taxes									7,352	4,663	[1]	4,378	[1]
Income tax expense (benefit)									1,576	(660)	[1]	1,379	[1]
NET INCOME	314	941	687	3,834	2,072	856	804	1,591	5,776	5,323	[1],[2],[3]	2,999	[1],[2],[3]
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									862	57	[1]	(93)	[1]
NET INCOME ATTRIBUTABLE TO NEE	$ 422	$ 1,005	$ 781	$ 4,431	$ 2,158	$ 846	$ 793	$ 1,583	6,638	5,380	[1]	2,906	[1]
Reportable Legal Entities [Member] | NEE (Guarantor) [Member]
Operating revenues									0	0		0
Operating expenses - net									(196)	(175)		(163)
Interest expense									(17)	(3)		(1)
Equity in earnings of subsidiaries									6,548	5,393		2,950
Equity in earnings of equity method investees									0	0		0
Gain on NEP deconsolidation									0	0		0
Other income - net									169	151		148
Income (loss) before income taxes									6,504	5,366		2,934
Income tax expense (benefit)									(134)	(14)		28
NET INCOME									6,638	5,380		2,906
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0		0
NET INCOME ATTRIBUTABLE TO NEE									$ 6,638	5,380		2,906
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Ownership interest	100.00%								100.00%
Operating revenues									$ 5,007	5,301		5,266
Operating expenses - net									(3,652)	(3,273)		(3,655)
Interest expense									(940)	(1,074)		(637)
Equity in earnings of subsidiaries									0	0		0
Equity in earnings of equity method investees									358	141		148
Gain on NEP deconsolidation									3,927	0		0
Other income - net									21	702		645
Income (loss) before income taxes									4,721	1,797		1,767
Income tax expense (benefit)									1,195	(1,719)		350
NET INCOME									3,526	3,516		1,417
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									862	57		(93)
NET INCOME ATTRIBUTABLE TO NEE									4,388	3,573		1,324
Consolidation, Eliminations [Member]
Operating revenues									11,720	11,872		10,872
Operating expenses - net									(8,599)	(8,552)		(7,861)
Interest expense									(541)	(481)		(460)
Equity in earnings of subsidiaries									(6,548)	(5,393)		(2,950)
Equity in earnings of equity method investees									0	0		0
Gain on NEP deconsolidation									0	0		0
Other income - net									95	54		76
Income (loss) before income taxes									(3,873)	(2,500)		(323)
Income tax expense (benefit)									515	1,073		1,001
NET INCOME									(4,388)	(3,573)		(1,324)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0		0
NET INCOME ATTRIBUTABLE TO NEE									$ (4,388)	$ (3,573)		$ (1,324)

[1] Amounts have been retrospectively adjusted as discussed in Note 14 and Note 3 - Amendments to Presentation of Retirement Benefits.

[2] Amounts have been retrospectively adjusted as discussed in Note 14.

[3] Amounts have been retrospectively adjusted as discussed in Note 14.