Debt (Narrative) (Details) - USD ($)	1 Months Ended			3 Months Ended		12 Months Ended
	Sep. 30, 2020	Feb. 29, 2020	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2019	Aug. 31, 2018
Debt Instrument [Line Items]
Weighted-average interest rate of commercial paper and short-tem borrowings (in hundredths)						0.35%	1.95%
Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						$ 11,900,000,000
Letter of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						65,000,000
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						11,800,000,000
Revolving Credit Facility, Issuance of Letters of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						$ 2,000,000,000.0
FPL[Member]
Debt Instrument [Line Items]
Weighted-average interest rate of commercial paper and short-tem borrowings (in hundredths)						0.17%	1.80%
FPL[Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						$ 3,600,000,000
FPL[Member] | Letter of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						0
FPL[Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						3,600,000,000
FPL[Member] | Revolving Credit Facility, Issuance of Letters of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Available capacity						$ 572,000,000
NEE Equity Units February 2020 [Member]
Sale of equity units [Abstract]
Amount of equity units sold		$ 2,500,000,000
Stated amount of each equity unit (in dollars per share)		$ 50
Undivided beneficial ownership interest per debenture (in hundredths)		5.00%
Principal amount of each debenture		$ 1,000
Number of shares (subject to antidilution adjustments) if purchased on final settlement date at less than or equal to low range threshold (in shares)						0.7092
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares)						0.5672
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock		20 days
Rate of total annual distributions on equity units (in hundredths)						5.279%
Interest rate						1.84%
Rate of payments on stock purchase contracts (in hundredths)						3.439%
NEE Equity Units February 2020 [Member] | Minimum [Member]
Sale of equity units [Abstract]
The Adjusted Reference Price (in dollars per share)						$ 70.51
NEE Equity Units February 2020 [Member] | Maximum [Member]
Sale of equity units [Abstract]
Adjusted Threshold Appreciation Price						$ 88.14
NEE Equity Units September 2020 [Member]
Sale of equity units [Abstract]
Amount of equity units sold	$ 2,000,000,000.0
Stated amount of each equity unit (in dollars per share)	$ 50
Undivided beneficial ownership interest per debenture (in hundredths)	5.00%
Principal amount of each debenture	$ 1,000
Number of shares (subject to antidilution adjustments) if purchased on final settlement date at less than or equal to low range threshold (in shares)						0.6764
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares)						0.5412
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock	20 days
Rate of total annual distributions on equity units (in hundredths)						6.219%
Interest rate						0.509%
Rate of payments on stock purchase contracts (in hundredths)						5.71%
NEE Equity Units September 2020 [Member] | Minimum [Member]
Sale of equity units [Abstract]
The Adjusted Reference Price (in dollars per share)						$ 73.93
NEE Equity Units September 2020 [Member] | Maximum [Member]
Sale of equity units [Abstract]
Adjusted Threshold Appreciation Price						$ 92.41
NEE Equity Units September 2019 [Member]
Sale of equity units [Abstract]
Amount of equity units sold			$ 1,500,000,000	$ 1,500,000,000
Stated amount of each equity unit (in dollars per share)			$ 50	$ 50
Undivided beneficial ownership interest per debenture (in hundredths)			5.00%	5.00%
Principal amount of each debenture			$ 1,000	$ 1,000
Number of shares (subject to antidilution adjustments) if purchased on final settlement date at less than or equal to low range threshold (in shares)						0.8940
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares)						0.7156
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock			20 days
Rate of total annual distributions on equity units (in hundredths)						4.872%
Interest rate						2.10%
Rate of payments on stock purchase contracts (in hundredths)						2.772%
NEE Equity Units September 2019 [Member] | Minimum [Member]
Sale of equity units [Abstract]
The Adjusted Reference Price (in dollars per share)						$ 55.93
NEE Equity Units September 2019 [Member] | Maximum [Member]
Sale of equity units [Abstract]
Adjusted Threshold Appreciation Price						$ 69.91
Series H Debentures Due September 1, 2020 [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Debentures [Member]
Sale of equity units [Abstract]
Interest rate									3.342%
Debt Instrument, Face Amount									$ 700,000,000
Series I Debentures Due September 1, 2021 [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Debentures [Member]
Sale of equity units [Abstract]
Interest rate								2.403%
Debt Instrument, Face Amount								$ 1,500,000,000
September 2015 Equity Units Stock Split [Member]
Sale of equity units [Abstract]
Sale of Stock, Number of Shares Issued in Transaction					6,200,000	24,900,000
Sale of Stock, Consideration Received on Transaction					$ 700,000,000
August 2016 Equity Units Stock Split [Member]
Sale of equity units [Abstract]
Sale of Stock, Number of Shares Issued in Transaction				9,500,000		38,200,000
Sale of Stock, Consideration Received on Transaction				$ 1,500,000,000