Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018		Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating revenues	$ 4,075	$ 3,857	[1]
Operating expenses - net	2,940	2,798	[1]
Net income attributable to NEE	$ 680	4,431	[1]
Deemed capital structure of NextEra Energy Resources	70.00%
Total assets	$ 109,029			$ 103,702
Operating Segments [Member] | FPL [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,618	2,620
Operating expenses - net	1,761	1,913
Net income attributable to NEE	588	484
Total assets	54,324			53,484
Operating Segments [Member] | Gulf Power [Member]
Segment Reporting Information [Line Items]
Operating revenues	328
Operating expenses - net	271
Net income attributable to NEE	37
Total assets	5,378
Operating Segments [Member] | NextEra Energy Resources [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,135	1,241
Operating expenses - net	864	843
Net income attributable to NEE	301	3,929
Total assets	44,526			43,530
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	(6)	(4)
Operating expenses - net	44	42
Net income attributable to NEE	(246)	$ 18
Total assets	$ 4,801			$ 6,688

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