Summary of Significant Accounting and Reporting Policies (Additional Information) (Details) $ / shares in Units, account in Millions				1 Months Ended				3 Months Ended									12 Months Ended													37 Months Ended	48 Months Ended
	Jun. 30, 2019 USD ($) MW	Jan. 01, 2018 USD ($)	Jan. 01, 2017 USD ($)	Aug. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Aug. 31, 2015 USD ($) MW	Dec. 31, 2018 USD ($) account facility MW	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) MW	Dec. 31, 2017 USD ($)		Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) account facility MW	Dec. 31, 2018 USD ($) account facility MW	Dec. 31, 2018 USD ($) wind_generation_facility account facility MW	Dec. 31, 2018 USD ($) account facility MW	Dec. 31, 2018 USD ($) account facility pipeline MW	Dec. 31, 2018 USD ($) account facility solar_generation_facility MW	Dec. 31, 2018 USD ($) account facility MW	Dec. 31, 2018 USD ($) account facility unit MW	Dec. 31, 2017 USD ($) $ / shares		Dec. 31, 2016 USD ($) MW		Dec. 31, 2015 pipeline	Apr. 30, 2016 plant	Dec. 31, 2020 USD ($) kWh $ / kW MW	Dec. 31, 2016 USD ($) MW	Dec. 31, 2019 MW	Mar. 31, 2019 MW
Basis of Presentation [Abstract]
Number of customer accounts (more than) | account								5									5	5	5	5	5	5	5	5
Noncontrolling Interest [Abstract]
Number of long-term contracted natural gas pipeline assets | pipeline																													7
Investment in equity method investees								$ 6,748,000,000				$ 2,321,000,000	[1]				$ 6,748,000,000	$ 6,748,000,000	$ 6,748,000,000	$ 6,748,000,000	$ 6,748,000,000	$ 6,748,000,000	$ 6,748,000,000	$ 6,748,000,000	$ 2,321,000,000	[1]	$ 1,767,000,000					$ 1,767,000,000
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
Plant, Property, and Equipment, Decrease from Deconsolidation																		7,800,000,000
Long-term Debt, Decrease from Deconsolidation																		4,800,000,000
Noncontrolling Interest, Decrease from Deconsolidation																		2,700,000,000
Profit Sharing Liability, net of Amortization												862,000,000													862,000,000
FPSC rate orders [Abstract]
Revenue from contracts with customers																		15,400,000,000
Electric Plant, Depreciation and Amortization [Abstract]
Convertible ITCs																		1,200,000,000							1,900,000,000
Convertible ITCs included in other receivables								138,000,000									138,000,000	138,000,000	138,000,000	138,000,000	138,000,000	138,000,000	138,000,000	138,000,000
NET INCOME								422,000,000	$ 1,005,000,000	$ 781,000,000	$ 4,431,000,000	2,158,000,000		$ 846,000,000	$ 793,000,000	$ 1,583,000,000		6,638,000,000							5,380,000,000	[2]	2,906,000,000	[2]
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation								3,135,000,000				3,031,000,000					3,135,000,000	3,135,000,000	3,135,000,000	3,135,000,000	3,135,000,000	3,135,000,000	3,135,000,000	3,135,000,000	3,031,000,000		2,736,000,000					2,736,000,000
Restricted Cash [Abstract]
Restricted cash, current								4,615,000,000				269,000,000					4,615,000,000	4,615,000,000	4,615,000,000	4,615,000,000	4,615,000,000	4,615,000,000	4,615,000,000	4,615,000,000	269,000,000
restricted cash related to margin cash collateral that is netted against derivative instruments								184,000,000									184,000,000	184,000,000	184,000,000	184,000,000	184,000,000	184,000,000	184,000,000	184,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules								4,074,000,000				4,213,000,000					$ 4,074,000,000	4,074,000,000	4,074,000,000	4,074,000,000	4,074,000,000	4,074,000,000	4,074,000,000	4,074,000,000	4,213,000,000
Amortization period																	5 years
Unrecognized tax benefits that impact annual effective income tax rate								61,000,000									$ 61,000,000	61,000,000	61,000,000	61,000,000	61,000,000	61,000,000	61,000,000	61,000,000
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Increase (decrease) to retained earnings								23,837,000,000				19,020,000,000	[1]				23,837,000,000	23,837,000,000	23,837,000,000	$ 23,837,000,000	23,837,000,000	23,837,000,000	23,837,000,000	23,837,000,000	19,020,000,000	[1]
Net Income (Loss) Attributable to Noncontrolling Interest																		(862,000,000)							(57,000,000)	[2]	93,000,000	[2]
FPL[Member]
Regulated Operations [Abstract]
Number of generation facilities retired during period | facility																				3
Net book value								$ 41,499,000,000				39,124,000,000	[3]				$ 41,499,000,000	$ 41,499,000,000	$ 41,499,000,000	$ 41,499,000,000	$ 41,499,000,000	$ 41,499,000,000	$ 41,499,000,000	$ 41,499,000,000	39,124,000,000	[3]
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
FPSC rate orders [Abstract]
Increase in base rate revenues		$ 211,000,000	$ 400,000,000																													$ 350,000,000
Renewable energy assets, power generation capacity (mw) | MW								900			600						900	900	900	900	900	900	900	900
Regulatory return on common equity (in hundredths)																							9.60%									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%
Annual refunds requested																		$ 736,800,000
Equity ratio																							55.00%
Number of plants operational | plant																														3
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)								46.00%									46.00%	46.00%	46.00%	46.00%	46.00%	46.00%	46.00%	46.00%
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths)								12.00%									12.00%	12.00%	12.00%	12.00%	12.00%	12.00%	12.00%	12.00%
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths)								36.00%									36.00%	36.00%	36.00%	36.00%	36.00%	36.00%	36.00%	36.00%
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths)								6.00%									6.00%	6.00%	6.00%	6.00%	6.00%	6.00%	6.00%	6.00%
Convertible ITCs																		$ 134,000,000							$ 140,000,000
Maximum interval between depreciation studies performed and filed with the FPSC (in years)																									4 years
Amount of reserve (reversal) amortization recognized																		(541,000,000)							$ 1,250,000,000		$ 13,000,000
FPL's composite depreciation rate for electric plant in service (in hundredths)																							3.80%		3.70%		3.40%
NET INCOME								$ 407,000,000	$ 654,000,000	$ 626,000,000	$ 484,000,000	344,000,000		$ 566,000,000	$ 526,000,000	$ 445,000,000
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)																							5.97%		6.16%		6.34%
AFUDC capitalized for FPL																		114,000,000							$ 101,000,000		$ 97,000,000
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	$ 7,500,000,000	$ 7,500,000,000	$ 7,500,000,000	$ 7,500,000,000	$ 7,500,000,000	$ 7,500,000,000
FPL's Ultimate costs of nuclear decommissioning, in current year dollars								3,200,000,000									$ 3,200,000,000	3,200,000,000	3,200,000,000	3,200,000,000	3,200,000,000	3,200,000,000	3,200,000,000	3,200,000,000
FPL's fund earnings on decommissioning funds																		94,000,000							114,000,000		102,000,000
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	1,200,000,000	1,200,000,000	1,200,000,000	1,200,000,000	1,200,000,000	1,200,000,000	1,200,000,000
Ultimate Costs Of Plant Dismantlement In Current Year Dollars								513,000,000									513,000,000	513,000,000	513,000,000	513,000,000	513,000,000	513,000,000	513,000,000	513,000,000
Asset Retirement Obligation								2,147,000,000				2,047,000,000					2,147,000,000	2,147,000,000	2,147,000,000	2,147,000,000	2,147,000,000	2,147,000,000	2,147,000,000	2,147,000,000	2,047,000,000		1,919,000,000					$ 1,919,000,000
Restricted Cash [Abstract]
Restricted cash, current								142,000,000				141,000,000					142,000,000	142,000,000	142,000,000	142,000,000	142,000,000	142,000,000	142,000,000	142,000,000	141,000,000
Income Taxes [Abstract]
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules								4,042,000,000				4,180,000,000					4,042,000,000	4,042,000,000	4,042,000,000	4,042,000,000	4,042,000,000	4,042,000,000	4,042,000,000	4,042,000,000	4,180,000,000
Accumulated Deferred Investment Tax Credit								326,000,000				119,000,000					326,000,000	326,000,000	326,000,000	326,000,000	326,000,000	326,000,000	326,000,000	326,000,000	119,000,000
Deferred income tax benefit associated with convertible ITCs																		42,000,000							44,000,000
Disposal of a Business/Assets [Abstract]
Total generating facility capacity (mw) | MW							250
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Increase (decrease) to retained earnings								9,040,000,000				7,376,000,000	[3]				9,040,000,000	9,040,000,000	9,040,000,000	9,040,000,000	$ 9,040,000,000	9,040,000,000	9,040,000,000	9,040,000,000	7,376,000,000	[3]
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 costs												1,300,000,000													1,300,000,000
NEP [Member]
Noncontrolling Interest [Abstract]
Number of long-term contracted natural gas pipeline assets | pipeline																					7
NEER [Member]
Noncontrolling Interest [Abstract]
Investment in equity method investees								6,151,000,000				2,129,000,000					6,151,000,000	6,151,000,000	6,151,000,000	6,151,000,000	$ 6,151,000,000	6,151,000,000	6,151,000,000	6,151,000,000	2,129,000,000
Electric Plant, Depreciation and Amortization [Abstract]
Net book value of assets serving as collateral								9,100,000,000									9,100,000,000	9,100,000,000	9,100,000,000	9,100,000,000	9,100,000,000	9,100,000,000	9,100,000,000	9,100,000,000
Construction Activity [Abstract]
Project development costs of NextEra Energy Resources								$ 630,000,000				433,000,000					$ 630,000,000	630,000,000	$ 630,000,000	$ 630,000,000	$ 630,000,000	$ 630,000,000	$ 630,000,000	$ 630,000,000	433,000,000
Interest capitalized on construction projects of NextEra Energy Resources																		$ 94,000,000							89,000,000		107,000,000
Deemed capital structure of NextEra Energy Resources (in hundredths)								70.00%									70.00%	70.00%	70.00%	70.00%	70.00%	70.00%	70.00%	70.00%
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract]
Asset Retirement Obligation								$ 988,000,000				$ 984,000,000					$ 988,000,000	$ 988,000,000	$ 988,000,000	$ 988,000,000	$ 988,000,000	$ 988,000,000	$ 988,000,000	$ 988,000,000	$ 984,000,000		$ 817,000,000					$ 817,000,000
Ultimate Costs Of Nuclear Decommissioning For Wholly Owned Indirect Subsidiary								10,800,000,000									10,800,000,000	10,800,000,000	10,800,000,000	10,800,000,000	10,800,000,000	10,800,000,000	10,800,000,000	10,800,000,000
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Indirect Subsidiary								$ 2,100,000,000									$ 2,100,000,000	2,100,000,000	$ 2,100,000,000	$ 2,100,000,000	$ 2,100,000,000	$ 2,100,000,000	$ 2,100,000,000	$ 2,100,000,000
Ultimate costs to dismantle wind and solar facilities																		$ 1,600,000,000
Effective period for Seabrook's decommissioning funding plan (in years)																	4 years
Scenario, Forecast [Member] | FPL[Member]
FPSC rate orders [Abstract]
Increase in base rate revenues	$ 200,000,000
Renewable energy assets, power generation capacity (mw) | 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								55.00%				61.00%					55.00%	55.00%	55.00%	55.00%	55.00%	55.00%	55.00%	55.00%	61.00%
Nuclear Plant [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type								11.00%				9.00%					11.00%	11.00%	11.00%	11.00%	11.00%	11.00%	11.00%	11.00%	9.00%
Solar plants [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type								15.00%				15.00%					15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%
Oil and Gas Properties [Member] | NEER [Member]
Electric Plant, Depreciation and Amortization [Abstract]
Percentage of gross depreciable assets by plant type								14.00%				9.00%					14.00%	14.00%	14.00%	14.00%	14.00%	14.00%	14.00%	14.00%	9.00%
Minimum [Member] | Scenario, 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] | Scenario, 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%		65.20%					65.20%
Retained Earnings [Member] | FPL[Member]
Electric Plant, Depreciation and Amortization [Abstract]
NET INCOME																		$ 2,171,000,000							$ 1,880,000,000		$ 1,727,000,000
Coal Fired Generation Facility [Member] | FPL[Member]
Regulated Operations [Abstract]
Number of coal-fired electric generation facilities | facility								3									3	3	3	3	3	3	3	3
Number of retired coal-fired electric generation facilities | facility								2									2	2	2	2	2	2	2	2
Regulatory asset, amortization period																	9 years
Regulatory assets, net of amortization								$ 963,000,000				$ 1,128,000,000					$ 963,000,000	$ 963,000,000	$ 963,000,000	$ 963,000,000	$ 963,000,000	$ 963,000,000	$ 963,000,000	$ 963,000,000	1,128,000,000
wind and solar generation facilities [Member] | NEER [Member]
Disposal of a Business/Assets [Abstract]
Number Of Generation Facilities Sold																			10			1
Total generating facility capacity (mw) | MW								1,388									1,388	1,388	1,388	1,388	1,388	1,388	1,388	1,388
Proceeds from Divestiture of Interest in Consolidated Subsidiaries																		$ 1,300,000,000
Assumption Of Noncontrolling Interest								$ 941,000,000									$ 941,000,000	941,000,000	$ 941,000,000	$ 941,000,000	$ 941,000,000	$ 941,000,000	$ 941,000,000	$ 941,000,000
Gain on sale of ownership interest in subsidiary																		36,000,000
Gain on sale of ownership interest in subsidiary after tax																		32,000,000
Natural Gas Generation Facilities [Member] | Subsidiary of NEER [Member]
FPSC rate orders [Abstract]
Renewable energy assets, power generation capacity (mw) | MW																											840					840
Disposal of a Business/Assets [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) | MW																											2,884					2,884
Disposal of a Business/Assets [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]
Disposal of a Business/Assets [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
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 - Sales of Differential Membership Interests [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Increase (decrease) to retained earnings		34,000,000
Increase (decrease) in additional paid in capital		(77,000,000)
Income (Loss) Attributable to Noncontrolling Interest, before Tax																		497,000,000
Net Income (Loss) Attributable to Noncontrolling Interest																		373,000,000
Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member] | NEER [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Increase (decrease) to retained earnings		(52,000,000)
Increase (decrease) in additional paid in capital		839,000,000
Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member] | Additional Paid-in Capital [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Increase (decrease) in additional paid in capital, after tax		(59,000,000)
Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member] | Retained Earnings [Member]
Variable Interest Entities [Abstract]
Increase (decrease) to retained earnings, pretax		56,000,000
Accounting Standards Update 2017-05 - NEER Sale of Assets to NEP [Member] | Additional Paid-in Capital [Member] | NEER [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Increase (decrease) in additional paid in capital, after tax		649,000,000
Accounting Standards Update 2017-05 - NEER Sale of Assets to NEP [Member] | Retained Earnings [Member] | NEER [Member]
Variable Interest Entities [Abstract]
Increase (decrease) to retained earnings, pretax		$ (69,000,000)
Current other assets [Member]
Restricted Cash [Abstract]
Restricted cash, current								89,000,000				247,000,000					89,000,000	89,000,000	89,000,000	89,000,000	89,000,000	89,000,000	89,000,000	89,000,000	$ 247,000,000
Current other assets [Member] | FPL[Member]
Restricted Cash [Abstract]
Restricted cash, current								81,000,000				128,000,000					81,000,000	81,000,000	81,000,000	81,000,000	81,000,000	81,000,000	81,000,000	81,000,000	128,000,000
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
NEP [Member]
Noncontrolling Interest [Abstract]
Investment in equity method investees								4,400,000,000									4,400,000,000	4,400,000,000	4,400,000,000	4,400,000,000	4,400,000,000	4,400,000,000	4,400,000,000	4,400,000,000
Franchise and Gross Receipts Taxes [Member]
FPSC rate orders [Abstract]
Revenue from contracts with customers																		738,000,000							$ 767,000,000		$ 700,000,000
Retired Plant [Member] | FPL[Member]
Regulated Operations [Abstract]
Net book value								875,000,000									875,000,000	875,000,000	875,000,000	875,000,000	875,000,000	875,000,000	875,000,000	875,000,000
Amount of regulatory assets deferred								729,000,000									$ 729,000,000	729,000,000	729,000,000	729,000,000	729,000,000	729,000,000	729,000,000	729,000,000
Regulatory asset, amortization period																	15 years
Regulatory assets, net of amortization								$ 870,000,000									$ 870,000,000	$ 870,000,000	$ 870,000,000	$ 870,000,000	$ 870,000,000	$ 870,000,000	$ 870,000,000	$ 870,000,000

[1] Amounts have been retrospectively adjusted as discussed in Note 14.

[2] Amounts have been retrospectively adjusted as discussed in Note 14 and Note 3 - Amendments to Presentation of Retirement Benefits.

[3] Amounts have been retrospectively adjusted as discussed in Note 14.