Summary of Significant Accounting and Reporting Policies (Details)				1 Months Ended		2 Months Ended	3 Months Ended								12 Months Ended						48 Months Ended
	Jun. 30, 2019 USD ($) MW	Jan. 01, 2018 USD ($)	Jan. 01, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Feb. 16, 2018 USD ($)	Dec. 31, 2017 USD ($) MW	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) MW	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) unit project $ / shares MW shares		Dec. 31, 2016 USD ($) MW		Dec. 31, 2015 USD ($) MW		Dec. 31, 2020 USD ($) kWh $ / kW MW	Dec. 31, 2016 USD ($) MW	Dec. 31, 2019 MW	Mar. 31, 2018 MW	Jan. 31, 2018 MW	Oct. 30, 2016	Jul. 29, 2016 USD ($)	Oct. 31, 2015 USD ($)	Jul. 01, 2014
Basis of Presentation [Abstract]
Approximate number of customer accounts							5,000,000								5,000,000
Noncontrolling Interest [Abstract]
Profit Sharing Liability, net of Amortization							$ 866,000,000				$ 757,000,000				$ 866,000,000		$ 757,000,000					$ 757,000,000
Electric Plant, Depreciation and Amortization [Abstract]
Convertible ITCs															1,900,000,000		2,100,000,000
Convertible ITCs included in other receivables							138,000,000				289,000,000				138,000,000		289,000,000					289,000,000
NET INCOME							2,155,000,000	$ 847,000,000	$ 793,000,000	$ 1,583,000,000	966,000,000	$ 753,000,000	$ 540,000,000	$ 653,000,000	5,378,000,000		2,912,000,000		$ 2,752,000,000
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation							3,031,000,000				2,736,000,000				3,031,000,000		2,736,000,000		2,469,000,000			2,736,000,000
Restricted Cash [Abstract]
Restricted cash, current							269,000,000				237,000,000				269,000,000		237,000,000					237,000,000
restricted cash related to margin cash collateral that is netted against derivative instruments							83,000,000								83,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules							4,213,000,000				289,000,000				4,213,000,000		289,000,000					289,000,000
Unrecognized tax benefits that impact annual effective income tax rate							71,000,000								71,000,000
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Retained Earnings (Accumulated Deficit)							18,992,000,000				15,458,000,000				18,992,000,000		15,458,000,000					15,458,000,000
FPL[Member]
Revenues and Rates [Abstract]
Unbilled Receivables, Current							$ 423,000,000				261,000,000				423,000,000		261,000,000					261,000,000
Franchise fees and gross receipts taxes															767,000,000		700,000,000		722,000,000
Surcharges related to storm-recovery															$ 393,000,000		119,000,000		115,000,000
FPSC rate orders [Abstract]
Increase in base rate revenues			$ 400,000,000																			$ 350,000,000
Regulatory return on common equity (in hundredths)																						10.50%
Original Reserve Amount That May Be Amortized Under the 2012 Rate Agreement																						$ 400,000,000
Regulatory return on common equity range (in hundredths)																						1.00%
Earned regulatory ROE threshold below which retail base rate relief may be sought (in hundredths)																						9.50%
Earned regulatory ROE threshold above which retail base rate reduction may be sought (in hundredths)																						11.50%
Percentage of Certain Gains Received by Customers From Base Rate Revenue																						100.00%
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of electric generating assets to gross investment in electric utility plant in service (in hundredths)							49.00%								49.00%
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths)							11.00%								11.00%
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths)							34.00%								34.00%
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths)							6.00%								6.00%
Convertible ITCs															$ 140,000,000		147,000,000
Maximum interval between depreciation studies performed and filed with the FPSC (in years)															4
Amount of reserve (reversal) amortization recognized															$ 1,250,000,000		$ 13,000,000		$ (15,000,000)
FPL's composite depreciation rate for electric plant in service (in hundredths)															3.70%		3.40%		3.30%
NET INCOME							$ 344,000,000	$ 566,000,000	$ 526,000,000	$ 445,000,000	371,000,000	$ 515,000,000	$ 448,000,000	$ 393,000,000	$ 1,880,000,000	[1]	$ 1,727,000,000	[1]	$ 1,648,000,000	[1]
Construction Activity [Abstract]
Threshold of plant in service balance at which AFUDC may be recorded (in hundredths)															0.50%
AFUDC capitalization rate for FPL (in hundredths)															6.16%		6.34%		6.34%
AFUDC capitalized for FPL															$ 101,000,000		$ 97,000,000		$ 88,000,000
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Maximum interval between nuclear decommissioning studies submitted to the FPSC for approval (in years)															5 years
For FPL, number of nuclear units | unit															4
FPL's portion of the ultimate costs of nuclear decommissioning							7,500,000,000								$ 7,500,000,000
FPL's Ultimate costs of nuclear decommissioning, in current year dollars							3,100,000,000								3,100,000,000
FPL's fund earnings on decommissioning funds															$ 114,000,000		102,000,000		96,000,000
Maximum interval between plant dismantlement studies submitted to the FPSC for approval (in years)															4 years
Plant Dismantlement Approved Expense Prior Dismantlement Study															$ 18,000,000
Plant Dismantlement Approved Expense Effective January 2017															26,000,000
Ultimate Costs Of Plant Dismantlement							1,200,000,000								1,200,000,000
Ultimate Costs Of Plant Dismantlement In Current Year Dollars							497,000,000								497,000,000
Asset Retirement Obligation							2,047,000,000				1,919,000,000				2,047,000,000		1,919,000,000		1,822,000,000			$ 1,919,000,000
Major Maintenance Costs [Abstract]
Deferred Costs and Other Assets, Nuclear Maintenance Costs							65,000,000								65,000,000
Accrued liability for nuclear maintenance costs											65,000,000						65,000,000					65,000,000
Nuclear maintenance costs															42,000,000		89,000,000		90,000,000
Restricted Cash [Abstract]
Restricted cash, current							141,000,000				120,000,000				141,000,000		120,000,000					120,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules							4,180,000,000				266,000,000				4,180,000,000		266,000,000					266,000,000
Accumulated Deferred Investment Tax Credit							119,000,000				123,000,000				119,000,000		123,000,000					123,000,000
Deferred income tax benefit associated with convertible ITCs															44,000,000		46,000,000
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Retained Earnings (Accumulated Deficit)							7,376,000,000				6,875,000,000				7,376,000,000		6,875,000,000					6,875,000,000
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract]
Public utilities, proceeds from recovery of storm restoration costs				$ 201,000,000
Eligible storm restoration costs				294,000,000
Storm and property insurance reserve prior to Hurricane Hermine and Hurricane Matthew				93,000,000
Amount approved to replenish reserve amount				$ 117,000,000
Public utilities, provision for storm insurance reserve							74,000,000								74,000,000
Storm Restoration Costs							$ 1,300,000,000								$ 1,300,000,000
NEP [Member]
Noncontrolling Interest [Abstract]
Number of projects | project															26
FPSC rate orders [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW							3,728								3,728
NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Net book value of assets serving as collateral							$ 15,600,000,000								$ 15,600,000,000
Construction Activity [Abstract]
Project development costs of NextEra Energy Resources							$ 433,000,000				193,000,000				433,000,000		193,000,000					193,000,000
Interest capitalized on construction projects of NextEra Energy Resources															$ 89,000,000		107,000,000		100,000,000
Deemed capital structure of NextEra Energy Resources (in hundredths)							70.00%								70.00%
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation							$ 984,000,000				817,000,000				$ 984,000,000		817,000,000		647,000,000			817,000,000
Ultimate Costs Of Nuclear Decommissioning For Wholly Owned Indirect Subsidiary							10,800,000,000								10,800,000,000
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Indirect Subsidiary							2,000,000,000								2,000,000,000
Ultimate costs to dismantle wind and solar facilities															$ 1,900,000,000
Effective period for Seabrook's decommissioning funding plan (in years)															4 years
Major Maintenance Costs [Abstract]
Capitalized major maintenance costs							$ 79,000,000				$ 69,000,000				$ 79,000,000		69,000,000					$ 69,000,000
Major maintenance costs															$ 68,000,000		$ 74,000,000		$ 79,000,000
NEER [Member] | Variable Interest Entities Wind Primary Beneficiary [Member]
Variable Interest Entities [Abstract]
Wind Electric Generating Facility Capability | MW															8,197
NEER [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entities [Abstract]
Solar generating facility capability | MW															374
Forecast [Member] | FPL[Member]
FPSC rate orders [Abstract]
Increase in base rate revenues	$ 200,000,000	$ 211,000,000
Renewable Energy Assets, Power Generation Capacity | MW	1,750																				300		300	300
Regulatory return on common equity (in hundredths)																					10.55%
Earned regulatory ROE threshold below which retail base rate relief may be sought (in hundredths)																					9.60%
Earned regulatory ROE threshold above which retail base rate reduction may be sought (in hundredths)																					11.60%
Installed solar cost cap, per kilowatt | $ / kW																					1,750
Maximum Amount Of Depreciation Reserve That May Be Amortized																					$ 1,000,000,000.0
Reserve amount remaining under 2012 rate agreement that may be amortized																					250,000,000
Maximum Storm Surcharge																					4
Threshold Of Storm Restoration Costs In Any Given Calendar Year At Which Surcharge May Be Increased																					800,000,000
Threshold Of Storm Restoration Costs In Any Given Calendar Year At Which Surcharge May Be Increased, Amount Above Which May Be Recovered																					$ 400,000,000
Increment Of Usage In Kwh On Which Storm Surcharge Is Based | kWh																					1,000
Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type							61.00%				62.00%				61.00%		62.00%					62.00%
Nuclear Plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type							9.00%				10.00%				9.00%		10.00%					10.00%
Solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type							15.00%				14.00%				15.00%		14.00%					14.00%
Oil and Gas Properties [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type							9.00%				8.00%				9.00%		8.00%					8.00%
Minimum [Member] | Forecast [Member] | FPL[Member]
FPSC rate orders [Abstract]
Regulatory return on common equity (in hundredths)																					9.60%
Minimum [Member] | Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															25 years
Minimum [Member] | Nuclear Plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															20 years
Minimum [Member] | Solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															25 years
Maximum [Member] | Forecast [Member] | FPL[Member]
FPSC rate orders [Abstract]
Regulatory return on common equity (in hundredths)																					11.60%
Maximum [Member] | Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															35 years
Maximum [Member] | Nuclear Plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															47 years
Maximum [Member] | Solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															30 years
NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Noncontrolling interest ownership percentage							65.10%								65.10%														79.90%
Energy Future Holdings Corp. [Member]
Terminated Merger [Abstract]
EFH EFIH Termination Fee																											$ 275,000,000
HEI [Member]
Terminated Merger [Abstract]
merger termination fee											$ 90,000,000						$ 90,000,000					$ 90,000,000
Out of pocket expenses reimbursed to HEI											5,000,000						5,000,000					5,000,000
Common Units [Member] | NEP [Member]
Noncontrolling Interest [Abstract]
Common units sold during period (in shares) | shares															35,527,435
Common Units [Member] | NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Stock Purchase Program, Authorized Amount																												$ 150,000,000
Stock Purchase Program, Amount Purchased							$ 36,000,000								$ 36,000,000
Common Units [Member] | NEP [Member] | NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Common units sold during period (in shares) | shares															35,527,435
Common Units [Member] | Subsidiary of NextEra Energy [Member] | NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Common units sold during period (in shares) | shares															27,000,000
Coal Fired Generation Facility [Member] | FPL[Member]
Regulated Operations [Abstract]
Coal Fired Generating Facility Capacity | MW																			250
Termination of Purchased Power Agreement and Purchase Price of Generation Facility																			$ 521,000,000
Regulatory Assets																			$ 847,000,000
Regulatory Asset, Amortization Period																			9 years
Regulatory Assets, Net of Amortization							$ 636,000,000				$ 726,000,000				$ 636,000,000		$ 726,000,000					$ 726,000,000
Reduction To Reserve Amount Related to Settlement That May Be Amortized Under the 2012 Rate Agreement															30,000,000
Revised Reserve Amount That May Be Amortized Under the 2012 Rate Agreement Less Reduction Related to Settlement															$ 370,000,000
Subsequent Event [Member]
Noncontrolling Interest [Abstract]
Equity Method Investment, Realized Gain (Loss) on Deconsolidation, Before Tax						$ 4,000,000,000
Equity Method Investment, Realized Gain (Loss) on Deconsolidation, After Tax						$ 3,000,000,000
Subsequent Event [Member] | FPL[Member]
FPSC rate orders [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW																									300
Wind plants [Member] | Subsidiary of NEER [Member]
FPSC rate orders [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW							244								244
Natural Gas Generation Facilities [Member] [Member] | Subsidiary of NEER [Member]
FPSC rate orders [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW											840						840					840
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Proceeds from Divestiture of Interest in Consolidated Subsidiaries																	$ 260,000,000
Gain on sale of ownership interest in subsidiary																	191,000,000
Gain on sale of ownership interest in subsidiary after tax																	$ 113,000,000
Merchant Natural Gas Generation Facilities [Member] | Subsidiary of NEER [Member]
FPSC rate orders [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW											2,884						2,884					2,884
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Proceeds from Divestiture of Interest in Consolidated Subsidiaries																	$ 456,000,000
Gain on sale of ownership interest in subsidiary																	254,000,000
Gain on sale of ownership interest in subsidiary after tax																	106,000,000
FPL FiberNet [Member] | Indirect Wholly-Owned Subsidiary [Member]
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Proceeds from Divestiture of Interest in Consolidated Subsidiaries					$ 1,100,000,000
Repayment of long term debt					$ 370,000,000
Gain on sale of ownership interest in subsidiary															$ 1,100,000,000
Gain on sale of ownership interest in subsidiary after tax															685,000,000
Taxes other than income taxes and other - net [Member]
Noncontrolling Interest [Abstract]
Amortization of Deferred Gain on Sale of Property															$ 28,000,000		37,000,000
Indiantown, Florida [Member] | Coal Fired Generation Facility [Member] | FPL[Member]
Regulated Operations [Abstract]
Coal Fired Generating Facility Capacity | MW															330
Termination of Purchased Power Agreement and Purchase Price of Generation Facility							$ 451,000,000								$ 451,000,000
Regulatory Assets							451,000,000								$ 451,000,000
Regulatory Asset, Amortization Period															9 years
Regulatory Assets, Net of Amortization							401,000,000								$ 401,000,000
Termination of Purchased Power Agreement and Purchase Price of Generation Facility, Liabilities Assumed							218,000,000								218,000,000
Oncor Electric Delivery Company LLC [Member]
Terminated Merger [Abstract]
Business Acquisition, Percentage of Voting Interests to be Acquired in Merger																										100.00%
Oncor Electric Delivery Company LLC [Member] | EFH Merger Co., LLC [Member]
Terminated Merger [Abstract]
Business Acquisition, Percentage of Voting Interests to be Acquired in Merger																											80.00%
Energy Future Holdings Corp. [Member] | EFH Merger Co., LLC [Member]
Terminated Merger [Abstract]
Business Acquisition, Percentage of Voting Interests to be Acquired in Merger																											100.00%
Service Life [Member]
Electric Plant, Depreciation and Amortization [Abstract]
NET INCOME															$ 60,000,000
Earnings Per Share, Basic and Diluted | $ / shares															$ 0.12
Service Life [Member] | Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															30 years
Service Life [Member] | Maximum [Member] | Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)															35 years
Accounting Standards Update 2017-05 [Member] | Subsequent Event [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Retained Earnings (Accumulated Deficit)		50,000,000
Additional Paid in Capital		70,000,000
Accounting Standards Update 2017-05 [Member] | Subsequent Event [Member] | NEER [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Retained Earnings (Accumulated Deficit)		(50,000,000)
Additional Paid in Capital		$ (830,000,000)
Current other assets [Member]
Restricted Cash [Abstract]
Restricted cash, current							247,000,000								$ 247,000,000
Current other assets [Member] | FPL[Member]
Restricted Cash [Abstract]
Restricted cash, current							128,000,000								128,000,000
Other Noncurrent Assets [Member]
Restricted Cash [Abstract]
Restricted cash, current											$ 228,000,000						228,000,000					$ 228,000,000
Other Noncurrent Assets [Member] | FPL[Member]
Restricted Cash [Abstract]
Restricted cash, current											$ 120,000,000						$ 120,000,000					$ 120,000,000
Other Current Liabilities [Member] | FPL[Member]
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract]
Public utilities, accrued storm restoration costs							$ 428,000,000								$ 428,000,000

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