Segment Information (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
Segment Reporting Information [Line Items]
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
Interest income									54	51	81
Depreciation and amortization									4,216	3,911	2,357
Equity in earnings of equity method investees									66	358	141
Income tax expense (benefit)									448	1,576	(660)
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
Capital expenditures, independent power and other investments and nuclear fuel purchases									17,462	13,004	10,740
Property, plant and equipment	107,178				92,083				107,178	92,083	93,565
Accumulated depreciation and amortization	25,168				21,749				25,168	21,749	21,276
Total assets	117,691				103,702				117,691	103,702	97,963
Investment in equity method investees	$ 7,453				6,748				$ 7,453	6,748	2,321
NEER [Member]
Segment Reporting Information [Line Items]
Deemed capital structure of NextEra Energy Resources (in hundredths)	70.00%								70.00%
Operating Segments [Member] | FPL[Member]
Segment Reporting Information [Line Items]
Operating revenues									$ 12,192	11,862	11,972
Operating expenses - net									8,890	8,708	8,582
Interest expense									594	541	481
Interest income									5	4	2
Depreciation and amortization									2,524	2,633	940
Equity in earnings of equity method investees									0	0	0
Income tax expense (benefit)									441	539	1,106
Net income (loss)									2,334	2,171	1,880
Net income (loss) attributable to NEE									2,334	2,171	1,880
Capital expenditures, independent power and other investments and nuclear fuel purchases									5,755	5,135	5,291
Property, plant and equipment	$ 59,027				54,717				59,027	54,717	51,915
Accumulated depreciation and amortization - FPL	13,953				13,218				13,953	13,218	12,791
Total assets	57,188				53,484				57,188	53,484	50,254
Investment in equity method investees	0				0				0	0	0
Operating Segments [Member] | Gulf Power Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues									1,487
Operating expenses - net									1,216
Interest expense									55
Interest income									3
Depreciation and amortization									247
Equity in earnings of equity method investees									0
Income tax expense (benefit)									42
Net income (loss)									180
Net income (loss) attributable to NEE									180
Capital expenditures, independent power and other investments and nuclear fuel purchases									729
Property, plant and equipment	6,393								6,393
Accumulated depreciation and amortization - FPL	1,630								1,630
Total assets	5,855								5,855
Investment in equity method investees	0								0
Operating Segments [Member] | NEER [Member]
Segment Reporting Information [Line Items]
Operating revenues									5,639	4,984	5,275
Operating expenses - net									3,635	3,616	4,345
Interest expense									873	595	815
Interest income									38	40	72
Depreciation and amortization									1,387	1,230	1,414
Equity in earnings of equity method investees									67	321	136
Income tax expense (benefit)									162	1,196	(2,013)
Net income (loss)									1,426	3,842	2,940
Net income (loss) attributable to NEE									1,807	4,704	2,997
Capital expenditures, independent power and other investments and nuclear fuel purchases									6,505	7,189	5,415
Property, plant and equipment	41,499				37,063				41,499	37,063	41,567
Accumulated depreciation and amortization	9,457				8,461				9,457	8,461	8,460
Total assets	51,516				44,509				51,516	44,509	46,611
Investment in equity method investees	7,453				6,521				7,453	6,521	2,173
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues									(114)	(119)	(74)
Operating expenses - net									110	123	(927)
Interest expense									727	362	262
Interest income									8	7	7
Depreciation and amortization									58	48	3
Equity in earnings of equity method investees									(1)	37	5
Income tax expense (benefit)									(197)	(159)	247
Net income (loss)									(552)	(237)	503
Net income (loss) attributable to NEE									(552)	(237)	503
Capital expenditures, independent power and other investments and nuclear fuel purchases									4,473	680	34
Property, plant and equipment	259				303				259	303	83
Accumulated depreciation and amortization	128				70				128	70	25
Total assets	3,132				5,709				3,132	5,709	1,098
Investment in equity method investees	$ 0				$ 227				$ 0	$ 227	$ 148