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Environmental Matters (Details)
$ in Millions
 8 Months Ended 9 Months Ended
Jun. 27, 2024
state
Dec. 31, 2024
state
Sep. 30, 2025
USD ($)
state
facility
Dec. 31, 2022
facility
Commitments and Contingencies Disclosure [Abstract]        
Environmental proceedings, disclosure threshold | $     $ 1  
Number of plants | facility     2 2
Number of states challenging the EPA's repeal of the ACE Rule and revision of GHG regulations   27    
Number of states supporting the EPA's repeal of the ACE Rule and revision of GHG regulations   22    
Number of states challenging the EPA's rule     23  
Number of states, FIP, stayed by the U.S. Supreme Court 11