Summary of Significant Accounting and Reporting Policies (Details) $ in Thousands, € in Millions			1 Months Ended		3 Months Ended
	Jan. 01, 2023 USD ($)	Feb. 11, 2020 solar_generation_facility MW	Jan. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2026 MW	Dec. 31, 2025 MW	Dec. 31, 2020 USD ($)		Mar. 31, 2020 EUR (€)
Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents				$ 703,000			$ 703,000				$ 441,000
Restricted cash related to margin cash collateral that is netted against derivative instruments				60,000			60,000				183,000
restricted cash related to margin cash collateral that is netted against derivative liabilities				45,000			45,000				136,000
Gain in connection with sale							(14,000)	$ (273,000)
Retained earnings				26,273,000			26,273,000				25,363,000
Bad Debt Expense							152,000	11,000
Gulf Power Segment
Accounting Policies [Line Items]
Regulatory Assets, Coal Generating Assets, Remaining Net Book Value				462,000			462,000
Hurricane Sally | Gulf Power Segment
Accounting Policies [Line Items]
Recoverable storm costs				187,000
FPL [Member]
Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents				94,000			94,000				135,000
Retained earnings				10,396,000			10,396,000				9,619,000	[1]
FPL [Member] | Forecast [Member]
Accounting Policies [Line Items]
Base Rate Plan Term			4 years
Increase In Base Rate Revenues	$ 607,000		$ 1,108,000
Renewable Energy Assets, Power Generation Capacity | MW									894	894
Base Rate Adjustments, Renewable Energy Assets					$ 140,000	$ 140,000
Regulatory Return On Common Equity			11.50%
Basis Point Incentive			0.50%
Combined Utility Rate Plan Term			2 years
Separate Utility Rate Plan Term			2 years
Other Current Assets [Member]
Accounting Policies [Line Items]
Restricted cash and cash equivalents, current				669,000			669,000				374,000
Other Current Assets [Member] | FPL [Member]
Accounting Policies [Line Items]
Restricted cash and cash equivalents, current				$ 84,000			$ 84,000				$ 93,000
Two solar generation facilities located in Spain [Member] | Disposed of by Sale [Member]
Accounting Policies [Line Items]
Gain in connection with sale								260,000
Gain (after tax) in connection with sale								260,000
Two solar generation facilities located in Spain [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member]
Accounting Policies [Line Items]
Number of generation facilities sold | solar_generation_facility		2
Generating capacity (MW) | MW		99.8
Purchase price								$ 121,000					€ 111

[1] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 5 - Merger of FPL and Gulf Power Company.