Derivative Instruments (Income Statement Disclosure) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Florida Power & Light Company
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment	$ 9	$ 25	$ 2	$ (79)
Not Designated as Hedging Instrument
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	2,871	202	3,414	(492)
Not Designated as Hedging Instrument \| Commodity contracts \| Income Statement Location [Axis]: us-gaap:RegulatedAndUnregulatedOperatingRevenue
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(168)	347	111	438
Unrealized Gain (Loss) on Derivatives	(79)	352	205	288
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Income Statement Location [Axis]: nee:InterestExpenseAggregateExpenses
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(5)	(56)	(186)	(40)
Unrealized Gain (Loss) on Derivatives	(4)	(54)	(138)	(30)
Not Designated as Hedging Instrument \| Interest rate contracts \| Income Statement Location [Axis]: nee:InterestExpenseAggregateExpenses
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	3,045	(88)	3,490	(889)
Unrealized Gain (Loss) on Derivatives	3,005	(94)	3,527	(1,057)
Reclassification out of Accumulated Other Comprehensive Income \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Income Statement Location [Axis]: nee:InterestExpenseAggregateExpenses
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Interest Expense	(1)	(1)	(2)	(2)
Reclassification out of Accumulated Other Comprehensive Income \| Not Designated as Hedging Instrument \| Interest rate contracts \| Income Statement Location [Axis]: nee:InterestExpenseAggregateExpenses
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Interest Expense	$ 0	$ 0	$ 1	$ 1