Segment Information (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating revenues	$ 4,390	$ 4,416	$ 4,063	$ 3,857	$ 4,004		$ 4,803	$ 4,399	$ 3,967	$ 16,727	$ 17,173	[1]	$ 16,138	[1]
Operating expenses - net										12,447	12,000	[1]	11,679	[1]
Interest expense										1,498	1,558	[1]	1,098	[1]
Interest income										51	81	[1]	82	[1]
Depreciation and amortization										3,911	2,357	[1]	3,120	[1]
Equity in earnings of equity method investees										358	141	[1],[2]	148	[1],[2]
Income tax expense (benefit)										1,576	(660)	[1]	1,379	[1]
Net income (loss)	314	941	687	3,834	2,072		856	804	1,591	5,776	5,323	[1],[2],[3]	2,999	[1],[2],[3]
Net income (loss) attributable to NEE	422	$ 1,005	$ 781	$ 4,431	2,158		$ 846	$ 793	$ 1,583	6,638	5,380	[1]	2,906	[1]
Capital expenditures, independent power and other investments and nuclear fuel purchases										13,004	10,740		9,636
Property, plant and equipment	92,083				93,565					92,083	93,565		86,798
Accumulated depreciation and amortization	21,749				21,276	[4]				21,749	21,276	[4]	20,018
Total assets	103,702				97,963	[4]				103,702	97,963	[4]	90,474
Investment in equity method investees	$ 6,748				2,321	[4]				$ 6,748	2,321	[4]	1,767
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										$ 11,862	11,972		10,895
Operating expenses - net										8,708	8,582		7,734
Interest expense										541	481		459
Interest income										4	2		2
Depreciation and amortization										2,633	940		1,700
Equity in earnings of equity method investees										0	0		0
Income tax expense (benefit)										539	1,106		1,051
Net income (loss)										2,171	1,880		1,727
Net income (loss) attributable to NEE										2,171	1,880		1,727
Capital expenditures, independent power and other investments and nuclear fuel purchases										5,135	5,291		3,934
Property, plant and equipment	$ 54,717				51,915					54,717	51,915		48,247
Accumulated depreciation and amortization - FPL	13,218				12,791					13,218	12,791		12,295
Total assets	53,484				50,254					53,484	50,254		45,887
Investment in equity method investees	0				0					0	0		0
Operating Segments [Member] | NEER [Member]
Segment Reporting Information [Line Items]
Revenues										4,878	5,164		4,876
Operating expenses - net										3,568	4,296		3,411
Interest expense										581	801		733
Interest income										40	72		34
Depreciation and amortization										1,205	1,393		1,360
Equity in earnings of equity method investees										320	136		119
Income tax expense (benefit)										1,187	(2,031)		238
Net income (loss)										3,802	2,907		1,211
Net income (loss) attributable to NEE										4,664	2,964		1,118
Capital expenditures, independent power and other investments and nuclear fuel purchases										7,138	5,375		5,521
Property, plant and equipment	36,063				40,615					36,063	40,615		37,495
Accumulated depreciation and amortization	8,364				8,371					8,364	8,371		7,580
Total assets	43,530				45,671					43,530	45,671		41,835
Investment in equity method investees	6,494				2,153					6,494	2,153		1,661
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues										(13)	37		367
Operating expenses - net										171	(878)		534
Interest expense										376	276		(94)
Interest income										7	7		46
Depreciation and amortization										73	24		60
Equity in earnings of equity method investees										38	5		29
Income tax expense (benefit)										(150)	265		90
Net income (loss)										(197)	536		61
Net income (loss) attributable to NEE										(197)	536		61
Capital expenditures, independent power and other investments and nuclear fuel purchases										731	74		181
Property, plant and equipment	1,303				1,035					1,303	1,035		1,056
Accumulated depreciation and amortization	167				114					167	114		143
Total assets	6,688				2,038					6,688	2,038		2,752
Investment in equity method investees	$ 254				$ 168					$ 254	$ 168		$ 106

[1] Amounts have been retrospectively adjusted as discussed in Note 14 and Note 3 - Amendments to Presentation of Retirement Benefits.

[2] Amounts have been retrospectively adjusted as discussed in Note 14.

[3] Amounts have been retrospectively adjusted as discussed in Note 14.

[4] Amounts have been retrospectively adjusted as discussed in Note 14.