Summarized Financial Information of NEECH - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues	$ 4,588	$ 5,572	$ 4,970	$ 4,075	$ 4,390	$ 4,416	$ 4,063	$ 3,857	$ 19,204	$ 16,727	$ 17,173
Operating expenses - net									(13,851)	(12,447)	(12,000)
Interest expense									(2,249)	(1,498)	(1,558)
Equity in earnings of subsidiaries									0	0	0
Equity in earnings of equity method investees									66	358	141
Gain on NEP deconsolidation									0	3,927	0
Other income - net									666	285	907
Income (loss) before income taxes									3,836	7,352	4,663
Income tax expense (benefit)									448	1,576	(660)
NET INCOME	844	798	1,139	606	314	941	687	3,834	3,388	5,776	5,323
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									381	862	57
NET INCOME ATTRIBUTABLE TO NEE	$ 975	$ 879	$ 1,234	$ 680	$ 422	$ 1,005	$ 781	$ 4,431	3,769	6,638	5,380
Reportable Legal Entities [Member] | NEE (Guarantor) [Member]
Operating revenues									0	0	0
Operating expenses - net									(209)	(196)	(175)
Interest expense									(3)	(17)	(3)
Equity in earnings of subsidiaries									3,785	6,548	5,393
Equity in earnings of equity method investees									0	0	0
Gain on NEP deconsolidation									0	0	0
Other income - net									185	169	151
Income (loss) before income taxes									3,758	6,504	5,366
Income tax expense (benefit)									(11)	(134)	(14)
NET INCOME									3,769	6,638	5,380
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0	0
NET INCOME ATTRIBUTABLE TO NEE									$ 3,769	6,638	5,380
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Ownership interest	100.00%								100.00%
Operating revenues									$ 5,671	5,007	5,301
Operating expenses - net									(3,669)	(3,652)	(3,273)
Interest expense									(1,596)	(940)	(1,074)
Equity in earnings of subsidiaries									0	0	0
Equity in earnings of equity method investees									66	358	141
Gain on NEP deconsolidation									0	3,927	0
Other income - net									407	21	702
Income (loss) before income taxes									879	4,721	1,797
Income tax expense (benefit)									(21)	1,195	(1,719)
NET INCOME									900	3,526	3,516
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									381	862	57
NET INCOME ATTRIBUTABLE TO NEE									1,281	4,388	3,573
Consolidation, Eliminations [Member]
Operating revenues									13,533	11,720	11,872
Operating expenses - net									(9,973)	(8,599)	(8,552)
Interest expense									(650)	(541)	(481)
Equity in earnings of subsidiaries									(3,785)	(6,548)	(5,393)
Equity in earnings of equity method investees									0	0	0
Gain on NEP deconsolidation									0	0	0
Other income - net									74	95	54
Income (loss) before income taxes									(801)	(3,873)	(2,500)
Income tax expense (benefit)									480	515	1,073
NET INCOME									(1,281)	(4,388)	(3,573)
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0	0	0
NET INCOME ATTRIBUTABLE TO NEE									$ (1,281)	$ (4,388)	$ (3,573)