Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating revenues	$ 3,699	$ 4,805	$ 3,817	$ 3,835	$ 4,069	$ 4,954	$ 4,358	$ 4,104	$ 16,155		$ 17,486		$ 17,021
Operating expenses - net									11,547		12,854		12,637
Interest expense									1,093		1,211		1,261
Interest income									82		86		80
Depreciation and amortization									3,077		2,831		2,551
Equity in losses (earnings) of equity method investees									148		107		93
Income tax expense (benefit)									1,383		1,228		1,176
Net Income (loss)	1,017	789	544	654	510	882	720	650	3,005		2,762		2,469
Net income (loss) attributable to parent	966	753	540	653	507	879	716	650	2,912		2,752		2,465
Capital expenditures, independent power and other investments and nuclear fuel purchases									9,636		8,377		7,017
Property, plant and equipment	87,013				80,330				87,013		80,330		73,639
Accumulated depreciation and amortization	20,101				18,944				20,101		18,944		17,934
Total assets	89,993				82,479				89,993		82,479		74,605
Investment in equity method investees	1,767				1,063				1,767		1,063		663
NEER [Member]
Segment Reporting Information [Line Items]
Operating revenues									4,893		5,444		5,196
Operating expenses - net									3,419		3,865		3,727
Interest expense									732		625		667
Interest income									34		28		26
Depreciation and amortization									1,366		1,183		1,051
Equity in losses (earnings) of equity method investees									119		103		95
Income tax expense (benefit)									242		289		283
Net Income (loss)									1,218		1,102		993
Net income (loss) attributable to parent									1,125		1,092		989
Capital expenditures, independent power and other investments and nuclear fuel purchases									5,521		4,661		3,701
Property, plant and equipment	37,644				33,340				37,644		33,340		30,178
Accumulated depreciation and amortization	7,655				6,640				7,655		6,640		6,268
Total assets	41,743				37,647				41,743		37,647		32,896
Investment in equity method investees	1,661				983				1,661		983		617
FPL [Member]
Segment Reporting Information [Line Items]
Operating expenses - net									7,737		8,674		8,593
Interest expense									456		445		439
Interest income									2		7		3
Equity in losses (earnings) of equity method investees									0		0		0
Net Income (loss)									1,727		1,648		1,517
Net income (loss) attributable to parent									1,727		1,648		1,517
Capital expenditures, independent power and other investments and nuclear fuel purchases									3,934		3,633		3,241
Property, plant and equipment	48,313				45,383				48,313		45,383		41,938
Accumulated depreciation and amortization - FPL	12,304				11,862				12,304		11,862		11,282
Total assets	45,501				42,523				45,501		42,523		39,222
Investment in equity method investees	0				0				0		0		0
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues									367		391		404
Operating expenses - net									391		315		317
Interest expense									(95)		141		155
Interest income									46		51		51
Depreciation and amortization									60		72		68
Equity in losses (earnings) of equity method investees									29		4		(2)
Income tax expense (benefit)									90		(18)		(17)
Net Income (loss)									60		12		(41)
Net income (loss) attributable to parent									60		12		(41)
Capital expenditures, independent power and other investments and nuclear fuel purchases									181		83		75
Property, plant and equipment	1,056				1,607				1,056		1,607		1,523
Accumulated depreciation and amortization	142				442				142		442		384
Total assets	2,749				2,309				2,749		2,309		2,487
Investment in equity method investees	106				80				106		80		46
FPL [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,558	3,283	2,750	2,303	2,839	3,274	2,996	2,541	10,895		11,651		11,421
Operating expenses - net									7,737		8,674		8,593
Interest expense									456		445		439
Depreciation and amortization									1,651		1,576		1,432
Income tax expense (benefit)									1,051		957		910
Net income (loss) attributable to parent	371	$ 515	$ 448	$ 393	365	$ 489	$ 435	$ 359	1,727	[1]	1,648	[1]	$ 1,517	[1]
Accumulated depreciation and amortization - FPL	12,304				11,862				12,304		11,862
Total assets	$ 45,501				$ 42,523				$ 45,501		$ 42,523

[1] FPL's comprehensive income is the same as reported net income