Commitments and Contingencies (Planned Capital Expenditures) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) MW
FPL [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	$ 2,180
2020	6,045
2021	6,120
2022	5,625
2023	5,570
Total	25,540
Gulf Power [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	465
2020	885
2021	665
2022	665
2023	720
Total	3,400
NextEra Energy Resources [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	1,675
2020	4,445
2021	590
2022	280
2023	220
Total	7,210
New Generation Expenditures [Member] | FPL [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	490
2020	1,380
2021	695
2022	505
2023	550
Total	3,620
Existing Generation Expenditures [Member] | FPL [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	410
2020	740
2021	1,050
2022	835
2023	790
Total	3,825
Transmission And Distribution Expenditures [Member] | FPL [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	965
2020	3,175
2021	3,685
2022	3,750
2023	3,750
Total	15,325
Allowance for funds used during construction (AFUDC) - remainder of 2019	5
Allowance for funds used during construction (AFUDC) - 2020	35
Allowance for funds used during construction (AFUDC) - 2021	40
Allowance for funds used during construction (AFUDC) - 2022	35
Allowance for funds used during construction (AFUDC) - 2023	35
Nuclear Fuel Expenditures [Member] | FPL [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	50
2020	205
2021	220
2022	165
2023	120
Total	760
General And Other Expenditures [Member] | FPL [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	265
2020	545
2021	470
2022	370
2023	360
Total	2,010
Wind Expenditures [Member] | NextEra Energy Resources [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	805
2020	3,055
2021	25
2022	20
2023	20
Total	$ 3,925
Planned new generation over 5 year period (in megawatts) | MW	4,815
Solar Expenditures [Member] | NextEra Energy Resources [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	$ 545
2020	605
2021	190
2022	0
2023	0
Total	$ 1,340
Planned new generation over 5 year period (in megawatts) | MW	1,525
Nuclear Expenditures [Member] | NextEra Energy Resources [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	$ 70
2020	160
2021	180
2022	170
2023	140
Total	720
Pipelines [Member] | NextEra Energy Resources [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	195
2020	530
2021	140
2022	20
2023	0
Total	885
Other Expenditures [Member] | NextEra Energy Resources [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	60
2020	95
2021	55
2022	70
2023	60
Total	340
Generation Expenditures [Member] | FPL [Member]
Planned Capital Expenditures [Line Items]
Allowance for funds used during construction (AFUDC) - remainder of 2019	15
Allowance for funds used during construction (AFUDC) - 2020	80
Allowance for funds used during construction (AFUDC) - 2021	70
Allowance for funds used during construction (AFUDC) - 2022	40
Allowance for funds used during construction (AFUDC) - 2023	20
Corporate and Other [Member]
Planned Capital Expenditures [Line Items]
Remainder of 2019	75
2020	285
2021	85
2022	0
2023	0
Total	$ 445