Segment Information (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)		Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)		Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				2
Operating revenues	$ 5,572	$ 4,416	[1]	$ 14,616	$ 12,337	[1]
Operating expenses - net	3,979	3,448	[1]	10,140	9,164	[1]
Net income (loss) attributable to NEE	$ 879	1,005	[1]	$ 2,794	6,216	[1]
Deemed capital structure of NextEra Energy Resources	70.00%			70.00%
Total assets	$ 114,222			$ 114,222			$ 103,702
Operating Segments [Member] | FPL [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,491	3,399		9,267	8,927
Operating expenses - net	2,518	2,482		6,582	6,382
Net income (loss) attributable to NEE	683	654		1,934	1,764
Total assets	56,165			56,165			53,484
Operating Segments [Member] | Gulf Power [Member]
Segment Reporting Information [Line Items]
Operating revenues	440			1,134
Operating expenses - net	332			901
Net income (loss) attributable to NEE	76			158
Total assets	5,459			5,459
Operating Segments [Member] | NextEra Energy Resources [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,619	1,018		4,192	3,414
Operating expenses - net	1,084	924		2,534	2,652
Net income (loss) attributable to NEE	367	212		1,330	4,401
Total assets	46,299			46,299			43,530
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	22	(1)		23	(4)
Operating expenses - net	45	42		123	130
Net income (loss) attributable to NEE	(247)	$ 139		(628)	$ 51
Total assets	$ 6,299			$ 6,299			$ 6,688

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