Commitments and Contingencies (Estimated Planned Capital Expenditures) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) MW
Corporate and Other [Member]
Planned Capital Expenditures [Line Items]
2018	$ 45
2019	25
2020	20
2021	15
2022	5
Total	110
FPL[Member]
Planned Capital Expenditures [Line Items]
2018	5,055
2019	3,880
2020	4,440
2021	4,625
2022	4,615
Total	22,615
FPL[Member] | New Generation Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	665
2019	555
2020	1,250
2021	1,105
2022	1,110
Total	4,685
FPL[Member] | Existing Generation Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	1,365
2019	695
2020	485
2021	530
2022	490
Total	3,565
FPL[Member] | Transmission and Distribution Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	2,395
2019	2,155
2020	2,280
2021	2,545
2022	2,570
Total	11,945
FPL[Member] | Nuclear Fuel Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	170
2019	150
2020	135
2021	145
2022	165
Total	765
FPL[Member] | General and Other Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	460
2019	325
2020	290
2021	300
2022	280
Total	1,655
FPL[Member] | Generation Expenditures [Member]
Planned Capital Expenditures [Line Items]
Allowance for funds used during construction (AFUDC) - 2018	118
Allowance for funds used during construction (AFUDC) - 2019	58
Allowance for funds used during construction (AFUDC) - 2020	49
Allowance for funds used during construction (AFUDC) - 2021	33
Allowance for funds used during construction (AFUDC) - 2022	16
NEER [Member]
Planned Capital Expenditures [Line Items]
2018	4,065
2019	2,135
2020	385
2021	280
2022	340
Total	7,205
NEER [Member] | Wind Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	2,105
2019	1,810
2020	110
2021	40
2022	40
Total	$ 4,105
Planned New Generation To Be Added over 5 Years | MW	3,600
NEER [Member] | Solar Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	$ 85
2019	0
2020	0
2021	0
2022	0
Total	$ 85
Planned New Generation To Be Added over 5 Years | MW	140
NEER [Member] | Nuclear Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	$ 265
2019	225
2020	205
2021	195
2022	240
Total	1,130
NEER [Member] | Pipelines [Member]
Planned Capital Expenditures [Line Items]
2018	955
2019	50
2020	25
2021	10
2022	25
Total	1,065
NEER [Member] | Other Expenditures [Member]
Planned Capital Expenditures [Line Items]
2018	655
2019	50
2020	45
2021	35
2022	35
Total	$ 820