Commitments and Contingencies (Insurance) (Details) $ in Millions	Sep. 30, 2025 USD ($)
Insurance [Abstract]
Maximum obtainable amount of private liability insurance available under Price-Anderson Act	$ 500
Amount of secondary financial protection liability insurance coverage per incident	15,800
Potential retrospective assessments under secondary financial protection system	1,161
Potential retrospective assessments under secondary financial protection system payable per incident per year	173
Amount Of Sublimit For Non Nuclear Perils Per Site Under NEIL For Property Damage Decontamination And Premature Decommissioning Risks	1,500
Additional nuclear accident limit	1,250
Potential amount of retrospective assessment per occurrence per site for property damage, decontamination and premature decommissioning risks	175
Florida Power & Light Company
Insurance [Abstract]
Potential retrospective assessments under secondary financial protection system	664
Potential retrospective assessments under secondary financial protection system payable per incident per year	99
Potential amount of retrospective assessment per occurrence per site for property damage, decontamination and premature decommissioning risks	110
Duane Arnold Energy Center Insurance [Member]
Insurance [Abstract]
Maximum obtainable amount of private liability insurance available under Price-Anderson Act	100
Amount Of Sublimit For Non Nuclear Perils Per Site Under NEIL For Property Damage Decontamination And Premature Decommissioning Risks	50
Seabrook Station Insurance [Member]
Insurance [Abstract]
Potential retrospective assessment recoverable from minority interest for nuclear liability secondary financial protection	20
Potential retrospective assessment recoverable from minority interest for property damage, decontamination and premature decommissioning risks	3
Duane Arnold Energy Center Insurance [Member]
Insurance [Abstract]
Potential retrospective assessment recoverable from minority interest for property damage, decontamination and premature decommissioning risks	2
St Lucie Unit No 2 Insurance [Member]
Insurance [Abstract]
Potential retrospective assessment recoverable from minority interest for nuclear liability secondary financial protection	25
Potential retrospective assessment recoverable from minority interest for property damage, decontamination and premature decommissioning risks	$ 4