Summary of Significant Accounting and Reporting Policies (Additional Information) (Details) € in Millions, account in Millions					1 Months Ended				12 Months Ended				48 Months Ended
	Feb. 11, 2020 USD ($) solar_generation_facility MW	Apr. 01, 2019 USD ($) MW	Jan. 01, 2018 USD ($)	Jan. 01, 2017 USD ($)	Sep. 30, 2019 USD ($) MW	Jun. 30, 2019 USD ($) solar_generation_facility wind_generation_facility MW	Aug. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2020 $ / kW MW	Dec. 31, 2019 USD ($) account facility unit MW	Dec. 31, 2018 USD ($) facility solar_generation_facility wind_generation_facility MW	Dec. 31, 2017 USD ($)	Dec. 31, 2020 USD ($) kWh MW	Jun. 30, 2020 MW	Feb. 11, 2020 EUR (€)	Mar. 31, 2019 MW	Mar. 31, 2018 MW	Sep. 30, 2017 USD ($)
Basis of Presentation [Abstract]
Number of customer accounts (more than) | account										5,000,000
Noncontrolling Interest [Abstract]
Investment in equity method investees										$ 7,453,000,000	$ 6,748,000,000	$ 2,321,000,000
Equity Method Investment, Realized Gain (Loss) on Deconsolidation, Before Tax											3,900,000,000
Equity Method Investment, Realized Gain (Loss) on Deconsolidation, After Tax											3,000,000,000.0
Regulated and Unregulated Operating Revenue [Abstract]
Revenue from contracts with customers										17,500,000,000	15,400,000,000
Electric Plant, Depreciation and Amortization [Abstract]
Convertible ITCs										824,000,000	1,200,000,000
Convertible ITCs included in other receivables										10,000,000	138,000,000
Construction Activity [Abstract]
Impairment charges										72,000,000	11,000,000	446,000,000
Impairment of long-lived assets, after tax										54,000,000
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation										3,506,000,000	3,135,000,000	3,031,000,000
Restricted Cash [Abstract]
Restricted cash, current										508,000,000	4,615,000,000
restricted cash related to margin cash collateral that is netted against derivative assets										139,000,000	184,000,000
restricted cash related to margin cash collateral that is netted against derivative liabilities										66,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules										$ 4,141,000,000	4,074,000,000
Amortization period										5 years
Unrecognized tax benefits that impact annual effective income tax rate										$ 79,000,000
Variable Interest Entities [Abstract]
Net Income (Loss) Attributable to Noncontrolling Interest										(381,000,000)	(862,000,000)	(57,000,000)
Redeemable noncontrolling interests											395,000,000
Disposal of a Business/Assets [Abstract]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal										406,000,000	$ 80,000,000	1,111,000,000
Variable Interest Entities Wind and Solar Primary Beneficiary [Member] [Member]
Variable Interest Entities [Abstract]
Income (Loss) Attributable to Noncontrolling Interest, before Tax										497,000,000
Net Income (Loss) Attributable to Noncontrolling Interest										373,000,000
FPL[Member]
Regulated Operations [Abstract]
Number of generation facilities retired during period | facility											3
Net book value										$ 45,074,000,000	$ 41,499,000,000
FPSC rate orders [Abstract]
Increase in base rate revenues		$ 200,000,000	$ 211,000,000	$ 400,000,000
Energy Assets, Power Generation Capacity | MW		1,720
Renewable energy assets, power generation capacity (mw) | MW										900						300	600
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of electric generating assets to gross investment in electric utility plant in service (in hundredths)										46.00%
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths)										12.00%
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths)										35.00%
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths)										7.00%
Convertible ITCs										$ 128,000,000	134,000,000
Maximum interval between depreciation studies performed and filed with the FPSC (in years)										4 years
Amount of reserve (reversal) amortization recognized										$ (357,000,000)	$ (541,000,000)	$ 1,250,000,000
FPL's composite depreciation rate for electric plant in service (in hundredths)										3.90%	3.80%	3.70%
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)										6.22%	5.97%	6.16%
AFUDC capitalized for FPL										$ 80,000,000	$ 114,000,000	$ 101,000,000
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										$ 9,700,000,000
FPL's Ultimate costs of nuclear decommissioning, in current year dollars										3,300,000,000
FPL's fund earnings on decommissioning funds										$ 125,000,000	94,000,000	114,000,000
Maximum interval between plant dismantlement studies submitted to the FPSC for approval (in years)										4 years
Plant Dismantlement Approved Expense Effective January 2017										$ 26,000,000
Ultimate Costs Of Plant Dismantlement										1,200,000,000
Ultimate Costs Of Plant Dismantlement In Current Year Dollars										510,000,000
Asset Retirement Obligation										2,268,000,000	2,147,000,000	2,047,000,000
Restricted Cash [Abstract]
Restricted cash, current										118,000,000	142,000,000
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, refund issued							$ 28,000,000
Storm costs reclassified to property, plant and equipment							$ 20,000,000
Storm restoration costs					$ 260,000,000													$ 1,300,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules										3,745,000,000	4,042,000,000
Accumulated Deferred Investment Tax Credit										412,000,000	326,000,000
Deferred income tax benefit associated with convertible ITCs										40,000,000	42,000,000
NEER [Member]
Noncontrolling Interest [Abstract]
Investment in equity method investees										6,876,000,000	6,151,000,000
Electric Plant, Depreciation and Amortization [Abstract]
Net book value of assets serving as collateral										10,000,000,000.0
Construction Activity [Abstract]
Project development costs of NextEra Energy Resources										651,000,000	630,000,000
Interest capitalized on construction projects of NextEra Energy Resources										$ 135,000,000	94,000,000	89,000,000
Deemed capital structure of NextEra Energy Resources (in hundredths)										70.00%
Impairment charges												420,000,000
Impairment of long-lived assets, after tax												$ 258,000,000
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation										$ 1,097,000,000	$ 988,000,000
Ultimate Costs Of Nuclear Decommissioning For Wholly Owned Indirect Subsidiary										9,500,000,000
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Indirect Subsidiary										2,000,000,000.0
Ultimate costs to dismantle wind and solar facilities										$ 1,800,000,000
Effective period for Seabrook's decommissioning funding plan (in years)										4 years
Variable Interest Entities [Abstract]
Wind Electric Generating Facility Capability | MW					220
NEER [Member] | Variable Interest Entities Wind and Solar Primary Beneficiary [Member] [Member]
Variable Interest Entities [Abstract]
Wind Electric Generating Facility Capability | MW										7,081
Solar generating facility capability | MW										473
Forecast [Member] | FPL[Member]
FPSC rate orders [Abstract]
Renewable energy assets, power generation capacity (mw) | MW									300				300	300
Base Rate Revenue, Installed Solar Cap Cost, Per Unit of Power | $ / kW									1,750
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%
Time period after filing of a cost recovery petition that future storm restoration costs would be recoverable on an interim basis													60 days
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
Cost Of Recovery Period													12 months
Wind plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type										54.00%	53.00%
Nuclear Plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type										10.00%	10.00%
Solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type										12.00%	14.00%
Oil and Gas Properties [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type										15.00%	13.00%
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)										23 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%
Coal Fired Generation Facility [Member] | FPL[Member]
Regulated Operations [Abstract]
Number of coal-fired electric generation facilities | facility										3
Number of retired coal-fired electric generation facilities | facility										2
Regulatory asset, amortization period										9 years
Regulatory assets, net of amortization										$ 799,000,000	$ 963,000,000
Current other assets [Member]
Restricted Cash [Abstract]
Restricted cash, current										411,000,000	89,000,000
Current other assets [Member] | FPL[Member]
Restricted Cash [Abstract]
Restricted cash, current										54,000,000	81,000,000
NEP [Member]
Noncontrolling Interest [Abstract]
Investment in equity method investees											4,400,000,000
Franchise and Gross Receipts Taxes [Member]
Regulated and Unregulated Operating Revenue [Abstract]
Revenue from contracts with customers										$ 763,000,000	738,000,000	$ 767,000,000
Retired Plant [Member] | FPL[Member]
Regulated Operations [Abstract]
Net book value											875,000,000
Amount of regulatory assets deferred											729,000,000
Regulatory asset, amortization period										15 years
Regulatory assets, net of amortization										$ 851,000,000	$ 870,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Two solar generation facilities located in Spain [Member]
Disposal of a Business/Assets [Abstract]
Disposal Group, Including Discontinued Operation, Other Assets, Current										440,000,000
Current other liabilities										647,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Three Wind Generation Facilities And Three Solar Generation Facilities [Member]
Disposal of a Business/Assets [Abstract]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal										341,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) On Disposal, Net Of Tax										$ 259,000,000
Disposal Group, Including Discontinued Operation, Stockholders' Equity Attributable to Noncontrolling Interest						$ 118,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Three Wind Generation Facilities And Three Solar Generation Facilities [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Total generating facility capacity (mw) | MW						611
Disposal Group, Including Discontinued Operation, Consideration						$ 1,000,000,000.0
Disposal Group, Including Discontinued Operation, Working Capital						$ 12,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Solar plants [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Number Of Generation Facilities Sold | solar_generation_facility						3					1
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Solar plants [Member] | Noncontrolling Interest [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Number Of Generation Facilities Sold | solar_generation_facility						2
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ten wind generation facilities and one solar generation facility [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Total generating facility capacity (mw) | MW											1,388
Disposal Group, Including Discontinued Operation, Consideration											$ 1,300,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal											36,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) On Disposal, Net Of Tax											32,000,000
Assumption Of Noncontrolling Interest											$ 941,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Wind plants [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Number Of Generation Facilities Sold | wind_generation_facility						3					10
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | FPL FiberNet [Member] | Indirect Wholly-Owned Subsidiary [Member]
Disposal of a Business/Assets [Abstract]
Disposal Group, Including Discontinued Operation, Consideration												1,100,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal												1,100,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) On Disposal, Net Of Tax												685,000,000
Repayment of long term debt												$ 370,000,000
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Two solar generation facilities located in Spain [Member]
Disposal of a Business/Assets [Abstract]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 260,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) On Disposal, Net Of Tax	$ 250,000,000
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Two solar generation facilities located in Spain [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Number Of Generation Facilities Sold | solar_generation_facility	2
Total generating facility capacity (mw) | MW	99.8
Disposal Group, Including Discontinued Operation, Consideration	$ 128,000,000														€ 117