Debt - Narrative (Details) - USD ($)	1 Months Ended			3 Months Ended	9 Months Ended
	Oct. 23, 2019	Sep. 30, 2019	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	[1]	Aug. 31, 2019
Debt Instrument [Line Items]
Issuances of long-term debt					$ 10,923,000,000	$ 4,028,000,000
NEE Equity Units 2019 [Member]
Debt Instrument [Line Items]
Amount of equity units sold		$ 1,500,000,000		$ 1,500,000,000	$ 1,500,000,000
Stated amount of each equity unit (in dollars per share)		$ 50		$ 50	$ 50
Undivided beneficial ownership interest per debenture (in hundredths)		5.00%		5.00%	5.00%
Principal amount of each debenture		$ 1,000		$ 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)		0.2231		0.2231	0.2231
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)		0.1785		0.1785	0.1785
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%		4.872%	4.872%
Rate of payments on stock purchase contracts (in hundredths)		2.772%		2.772%	2.772%
August 2016 Equity Units [Member]
Debt Instrument [Line Items]
Number of shares issued in transaction (in shares)				9,543,000
Consideration received on transaction				$ 1,500,000,000
Minimum [Member] | NEE Equity Units 2019 [Member]
Debt Instrument [Line Items]
Price per share of stock purchase contract (in dollars per share)		$ 224.12		$ 224.12	$ 224.12
Maximum [Member] | NEE Equity Units 2019 [Member]
Debt Instrument [Line Items]
Price per share of stock purchase contract (in dollars per share)		$ 280.15		$ 280.15	$ 280.15
NextEra Energy Capital Holdings, Inc. [Member]
Debt Instrument [Line Items]
Repayments of short-term term loan agreements			$ 4,500,000,000
NextEra Energy Capital Holdings, Inc. [Member] | Debentures Related To Nextera Energys Equity Units [Member]
Debt Instrument [Line Items]
Principal amount		$ 1,500,000,000		$ 1,500,000,000	$ 1,500,000,000
Interest rate (as a percent)		2.10%		2.10%	2.10%
NextEra Energy Capital Holdings, Inc. [Member] | Debentures [Member] | Series I Debentures Due September 1, 2021 [Member]
Debt Instrument [Line Items]
Principal amount								$ 1,500,000,000
Interest rate (as a percent)								2.403%
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Debentures, Series due November 1, 2029 [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	2.75%
Issuances of long-term debt	$ 1,000,000,000.0
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Debentures, Series due September 1, 2022 [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	1.95%
Issuances of long-term debt	$ 450,000,000

[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.