Summary of Significant Accounting and Reporting Policies (Details) customer in Millions, account in Millions					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 ($)	Jul. 01, 2014 USD ($) shares	Feb. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 customer	Sep. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) account MW	Dec. 31, 2016 USD ($) account unit project MW shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2020 USD ($) kWh $ / kW MW	Dec. 31, 2016 USD ($) account MW	Oct. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)
Basis of Presentation [Abstract]
Approximate number of customer accounts | account											4.9	4.9				4.9
Noncontrolling Interest [Abstract]
Profit Sharing Liability, net of Amortization											$ 757,000,000	$ 757,000,000	$ 447,000,000			$ 757,000,000
Electric Plant, Depreciation and Amortization [Abstract]
Convertible ITCs												2,100,000,000	1,800,000,000
Convertible ITCs included in other receivables											289,000,000	289,000,000	207,000,000			289,000,000
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation											2,736,000,000	2,736,000,000	2,469,000,000	$ 1,986,000,000		2,736,000,000
Restricted Cash [Abstract]
Restricted cash, current											311,000,000	311,000,000	244,000,000			311,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules											289,000,000	289,000,000	283,000,000			289,000,000
Unrecognized tax benefits that impact annual effective income tax rate											$ 40,000,000	$ 40,000,000				$ 40,000,000
NextEra Energy Partners [Member]
Noncontrolling Interest [Abstract]
Number of projects | project												22
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW											2,787	2,787				2,787
Partnership Interest [Member]
Noncontrolling Interest [Abstract]
Partners' Capital Account, Units, Sold in Public Offering | shares				18,687,500
Partners' Capital Account, Public Sale of Units Net of Offering Costs				$ 438,000,000
FPL [Member]
Revenues and Rates [Abstract]
Unbilled Receivables, Current											$ 261,000,000	$ 261,000,000	246,000,000			$ 261,000,000
Franchise fees and gross receipts taxes												700,000,000	722,000,000	716,000,000
Surcharges related to storm-recovery												$ 119,000,000	115,000,000	109,000,000
FPSC rate orders [Abstract]
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%
Increase in base rate revenues																$ 350,000,000
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)											50.00%	50.00%				50.00%
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths)											11.00%	11.00%				11.00%
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths)											33.00%	33.00%				33.00%
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths)											6.00%	6.00%				6.00%
Convertible ITCs												$ 147,000,000	153,000,000
Maximum interval between depreciation studies performed and filed with the FPSC (in years)												4
Amount of reserve (reversal) amortization recognized												$ 13,000,000	$ (15,000,000)	$ (33,000,000)
FPL's composite depreciation rate for electric plant in service (in hundredths)												3.40%	3.30%	3.30%
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)												6.34%	6.34%	6.34%
AFUDC capitalized for FPL												$ 97,000,000	$ 88,000,000	$ 50,000,000
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				$ 7,500,000,000
FPL's Ultimate costs of nuclear decommissioning, in current year dollars											3,000,000,000	3,000,000,000				3,000,000,000
FPL's fund earnings on decommissioning funds												$ 102,000,000	96,000,000	91,000,000
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											1,300,000,000	1,300,000,000				1,300,000,000
Ultimate Costs Of Plant Dismantlement In Current Year Dollars											480,000,000	480,000,000				480,000,000
Asset Retirement Obligation											1,919,000,000	1,919,000,000	1,822,000,000	1,355,000,000		1,919,000,000
Major Maintenance Costs [Abstract]
Accrued liability for nuclear maintenance costs											65,000,000	65,000,000	48,000,000			65,000,000
Nuclear maintenance costs												89,000,000	90,000,000	76,000,000
Restricted Cash [Abstract]
Restricted cash, current											120,000,000	120,000,000	75,000,000			120,000,000
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract]
Storm fund included in special use funds													74,000,000
Proceeds from withdraw of storm funds											74,000,000
Customers that lost electrical service | customer							1.2
Eligible storm restoration costs									$ 315,000,000
Storm and property insurance reserve prior to Hurricane Hermine and Hurricane Matthew								$ 112,000,000
Portion absorbed by Hurricane Hermine for property and insurance reserve								$ 20,000,000
Amount of storm costs that exceeded storm reserve											203,000,000	203,000,000				203,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules											266,000,000	266,000,000	268,000,000			266,000,000
Accumulated Deferred Investment Tax Credit											123,000,000	123,000,000	3,000,000			123,000,000
Deferred income tax benefit associated with convertible ITCs												46,000,000	48,000,000
NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Net book value of assets serving as collateral											15,500,000,000	15,500,000,000				15,500,000,000
Construction Activity [Abstract]
Project development costs of NextEra Energy Resources											$ 193,000,000	193,000,000	133,000,000			$ 193,000,000
Interest capitalized on construction projects of NextEra Energy Resources												$ 107,000,000	100,000,000	104,000,000
Deemed capital structure of NextEra Energy Resources (in hundredths)											70.00%	70.00%				70.00%
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation											$ 817,000,000	$ 817,000,000	647,000,000	631,000,000		$ 817,000,000
Ultimate Costs Of Nuclear Decommissioning For Wholly Owned Indirect Subsidiary											11,800,000,000	11,800,000,000				11,800,000,000
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Indirect Subsidiary											2,000,000,000	2,000,000,000				2,000,000,000
Ultimate costs to dismantle wind and solar facilities												$ 1,800,000,000
Effective period for Seabrook's decommissioning funding plan (in years)												4 years
Major Maintenance Costs [Abstract]
Capitalized major maintenance costs											$ 69,000,000	$ 69,000,000	97,000,000			$ 69,000,000
Major maintenance costs												$ 74,000,000	$ 79,000,000	$ 81,000,000
NEER [Member] | Variable Interest Entities Wind Primary Beneficiary [Member]
Variable Interest Entities [Abstract]
Wind Electric Generating Facility Capability | MW												6,847
NEER [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entities [Abstract]
Solar Generating Facility Capability | MW												374
Forecast [Member] | FPL [Member]
FPSC rate orders [Abstract]
Regulatory return on common equity (in hundredths)															10.55%
Increase in base rate revenues	$ 200,000,000	$ 211,000,000	$ 400,000,000
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
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW	1,750														300
Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type											62.00%	62.00%	62.00%			62.00%
Nuclear Plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type											10.00%	10.00%	11.00%			10.00%
natural gas plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type											1.00%	1.00%	3.00%			1.00%
Solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type											14.00%	14.00%	9.00%			14.00%
Oil and Gas Properties [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type											8.00%	8.00%	7.00%			8.00%
Minimum [Member] | Forecast [Member] | FPL [Member]
FPSC rate orders [Abstract]
Regulatory return on common equity (in hundredths)															9.60%
Minimum [Member] | wind, natural gas and solar 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)												25 years
Maximum [Member] | Forecast [Member] | FPL [Member]
FPSC rate orders [Abstract]
Regulatory return on common equity (in hundredths)															11.60%
Maximum [Member] | wind, natural gas and solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Property, plant and equipment, estimated useful lives (in years)												30 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
Indirect Wholly-Owned Subsidiary [Member] | Partnership Interest [Member]
Noncontrolling Interest [Abstract]
Payments to Acquire Limited Partnership Interests				$ 288,000,000
NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Partners' Capital Account, Units, Retained | shares				74,440,000
Noncontrolling interest ownership percentage				79.90%							65.20%	65.20%				65.20%
NEP OpCo [Member] | Partnership Interest [Member]
Noncontrolling Interest [Abstract]
Payments to Acquire Limited Partnership Interests				$ 150,000,000
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] | NextEra Energy Partners [Member]
Noncontrolling Interest [Abstract]
Common units sold during period | shares												35,527,435
Common Units [Member] | Subsidiary of NextEra Energy [Member] | NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Common units sold during period | shares												27,000,000
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				36,000,000
Common Units [Member] | NextEra Energy Partners [Member] | NEP OpCo [Member]
Noncontrolling Interest [Abstract]
Common units sold during period | shares												35,527,435
Coal Fired Generation Facility [Member] | FPL [Member]
Regulated Operations [Abstract]
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											$ 726,000,000	$ 726,000,000	$ 817,000,000			$ 726,000,000
Revised Reserve Amount That May Be Amortized Under the 2012 Rate Agreement Less Reduction Related to Settlement												370,000,000
Reduction To Reserve Amount Related to Settlement That May Be Amortized Under the 2012 Rate Agreement												$ 30,000,000
Subsequent Event [Member] | FPL [Member]
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract]
Amount approved to replenish reserve amount					$ 117,000,000
Natural Gas Generation Facilities [Member] [Member] | Subsidiary of NEER [Member]
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW											840	840				840
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]
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Renewable Energy Assets, Power Generation Capacity | MW											2,884	2,884				2,884
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] | Forecast [Member] | Indirect Wholly-Owned Subsidiary [Member]
Assets and Liabilities Associated with Assets Held for Sale [Abstract]
Gain on sale of ownership interest in subsidiary										$ 1,100,000,000
Gain on sale of ownership interest in subsidiary after tax										$ 700,000,000
FPL FiberNet [Member] | Subsequent Event [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
Taxes other than income taxes and other - net [Member]
Noncontrolling Interest [Abstract]
Amortization of Deferred Gain on Sale of Property												$ 37,000,000