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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.

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