Commitments and Contingencies (Estimated Planned Capital Expenditures) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) MW	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Planned Capital Expenditures [Line Items]
Capital expenditures	$ 3,776	$ 3,428	$ 3,067
FPL [Member]
Planned Capital Expenditures [Line Items]
2017	5,380
2018	3,765
2019	4,480
2020	3,585
2021	4,000
Total	21,210
Capital expenditures	3,776	$ 3,428	$ 3,067
FPL [Member] | New Generation Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	1,385
2018	655
2019	485
2020	35
2021	5
Total	2,565
FPL [Member] | Existing Generation Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	1,240
2018	635
2019	680
2020	645
2021	600
Total	3,800
FPL [Member] | Transmission and Distribution Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	2,190
2018	2,010
2019	2,860
2020	2,475
2021	2,945
Total	12,480
FPL [Member] | Nuclear Fuel Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	125
2018	190
2019	170
2020	210
2021	120
Total	815
FPL [Member] | General and Other Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	440
2018	275
2019	285
2020	220
2021	330
Total	1,550
FPL [Member] | Generation Expenditures [Member]
Planned Capital Expenditures [Line Items]
Allowance for funds used during construction (AFUDC) - 2017	81
Allowance for funds used during construction (AFUDC) - 2018	79
Allowance for funds used during construction (AFUDC) - 2019	46
Allowance for funds used during construction (AFUDC) - 2020	6
NEER [Member]
Planned Capital Expenditures [Line Items]
2017	2,115
2018	2,180
2019	1,040
2020	360
2021	315
Total	6,010
NEER [Member] | Wind Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	570
2018	955
2019	705
2020	75
2021	25
Total	$ 2,330
Planned New Generation To Be Added over 5 Years | MW	2,760
NEER [Member] | Solar Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	$ 80
2018	75
2019	15
2020	0
2021	0
Total	$ 170
Planned New Generation To Be Added over 5 Years | MW	225
NEER [Member] | Nuclear Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	$ 240
2018	250
2019	230
2020	225
2021	245
Total	1,190
NEER [Member] | Pipelines [Member]
Planned Capital Expenditures [Line Items]
2017	890
2018	845
2019	50
2020	20
2021	10
Total	1,815
NEER [Member] | Other Expenditures [Member]
Planned Capital Expenditures [Line Items]
2017	335
2018	55
2019	40
2020	40
2021	35
Total	505
Corporate and Other [Member]
Planned Capital Expenditures [Line Items]
2017	45
2018	30
2019	85
2020	55
2021	35
Total	$ 250