Segment Information (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)		Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)		Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				2
Operating revenues	$ 4,970	$ 4,063	[1]	$ 9,044	$ 7,920	[1]
Operating expenses - net	3,223	2,917	[1]	6,162	5,715	[1]
Net income (loss) attributable to NEE	$ 1,234	781	[1]	$ 1,914	5,212	[1]
Deemed capital structure of NextEra Energy Resources	70.00%			70.00%
Total assets	$ 110,552			$ 110,552			$ 103,702
Operating Segments [Member] | FPL [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,158	2,908		5,776	5,528
Operating expenses - net	2,304	1,987		4,064	3,900
Net income (loss) attributable to NEE	663	626		1,251	1,110
Total assets	55,263			55,263			53,484
Operating Segments [Member] | Gulf Power [Member]
Segment Reporting Information [Line Items]
Operating revenues	366			694
Operating expenses - net	298			569
Net income (loss) attributable to NEE	45			81
Total assets	5,405			5,405
Operating Segments [Member] | NextEra Energy Resources [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,437	1,156		2,572	2,396
Operating expenses - net	584	886		1,448	1,728
Net income (loss) attributable to NEE	661	260		963	4,189
Total assets	45,230			45,230			43,530
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	9	(1)		2	(4)
Operating expenses - net	37	44		81	87
Net income (loss) attributable to NEE	(135)	$ (105)		(381)	$ (87)
Total assets	$ 4,654			$ 4,654			$ 6,688

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