Debt - Long-term Debt Issuances and Borrowings (Details) - USD ($)	1 Months Ended	9 Months Ended
	Oct. 23, 2019	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Repayments of Debt		$ 3,561,000,000	$ 2,593,000,000	[1]
FPL [Member]
Debt Instrument [Line Items]
Repayments of Debt		85,000,000	$ 1,580,000,000	[2]
FPL [Member] | First mortgage bonds [Member]
Debt Instrument [Line Items]
Principal Amount		1,400,000,000
FPL [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Principal Amount		$ 1,000,000,000
Interest Rate Terms		Variable
FPL [Member] | Minimum [Member] | First mortgage bonds [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)		3.15%
FPL [Member] | Maximum [Member] | First mortgage bonds [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)		3.99%
Gulf Power [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Principal Amount		$ 300,000,000
Interest Rate Terms		Variable
NextEra Energy Capital Holdings, Inc. [Member] | Debentures variable [Domain]
Debt Instrument [Line Items]
Principal Amount		$ 550,000,000
Interest Rate Terms		Variable
NextEra Energy Capital Holdings, Inc. [Member] | Debentures [Member]
Debt Instrument [Line Items]
Principal Amount		$ 3,500,000,000
NextEra Energy Capital Holdings, Inc. [Member] | Junior Subordinated Debentures 5.65% Due 2079 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Principal Amount		$ 1,188,000,000
Interest Rate (as a percent)		5.65%
NextEra Energy Capital Holdings, Inc. [Member] | Debentures Related To Nextera Energys Equity Units [Member]
Debt Instrument [Line Items]
Principal Amount		$ 1,500,000,000
Interest Rate (as a percent)		2.10%
NextEra Energy Capital Holdings, Inc. [Member] | Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Principal Amount		$ 1,200,000,000
Interest Rate Terms		Variable
NextEra Energy Capital Holdings, Inc. [Member] | Junior Subordinated Debentures Variable Rate Due 2079 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Principal Amount		$ 500,000,000
NextEra Energy Capital Holdings, Inc. [Member] | Minimum [Member] | Debentures [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)		2.90%
NextEra Energy Capital Holdings, Inc. [Member] | Maximum [Member] | Debentures [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)		3.50%
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 700,000,000
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%

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

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