Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Condensed consolidated quarterly financial information [Abstract]
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 income		878	1,593	1,747	1,135	1,107	968	1,146	1,059	5,353	4,280	5,173
Net income (loss)		844	798	1,139	606	314	941	687	3,834	3,388	5,776	5,323
Net income (loss) attributable to NEE		$ 975	$ 879	$ 1,234	$ 680	$ 422	$ 1,005	$ 781	$ 4,431	$ 3,769	$ 6,638	$ 5,380
Basic EPS - Net income (in dollars per share)		$ 2.00	$ 1.82	$ 2.58	$ 1.42	$ 0.88	$ 2.12	$ 1.66	$ 9.41	$ 7.82	$ 14.03	$ 11.48
Diluted EPS - Net income (in dollars per share)		1.99	1.81	2.56	1.41	0.88	2.10	1.61	9.32	7.76	13.88	11.39
Dividends per share of common stock (in dollars per share)		1.25	1.25	1.25	1.25	1.11	1.11	1.11	1.11	$ 5.00	$ 4.44	$ 3.93
High common stock sales price (in dollars per share)		245.01	233.45	208.91	195.55	184.20	175.65	169.53	164.41
Low common stock sales price (in dollars per share)		$ 220.66	$ 201.06	$ 187.30	$ 168.66	$ 164.78	$ 163.52	$ 155.06	$ 145.10
FPL[Member]
Condensed consolidated quarterly financial information [Abstract]
Operating revenues		$ 2,925	$ 3,491	$ 3,158	$ 2,618	$ 2,935	$ 3,399	$ 2,908	$ 2,620	$ 12,192	$ 11,862	$ 11,972
Operating income		617	973	854	857	609	917	921	707	3,302	3,154	3,390
Net income (loss)	[1]									$ 2,334	$ 2,171	$ 1,880
Net income (loss) attributable to NEE		$ 400	$ 683	$ 663	$ 588	$ 407	$ 654	$ 626	$ 484

[1] FPL's comprehensive income is the same as reported net income.