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Acquisitions, Development and Divestitures - Acquisitions (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Nov. 06, 2023
Dec. 31, 2022
MW
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure [Line Items]          
Operating Revenues     $ 9,042 $ 8,462 $ 8,312
Net income (loss)     1,181 888 740
Transition Service Agreement Expense       137 228
Goodwill     2,247 2,247  
Disposal Group [Line Items]          
Transition Service Agreement Expense       137 228
Corporate And Other [Member]          
Disclosure [Line Items]          
Operating Revenues     1 0 1
Net income (loss)     217 415 427
Goodwill     860    
Rhode Island Regulated          
Disclosure [Line Items]          
Operating Revenues     2,168 2,024 1,851
Net income (loss)     (85) (109) (96)
Goodwill     725    
Kentucky Utilities Co [Member]          
Disclosure [Line Items]          
Operating Revenues     2,064 1,964 1,884
Net income (loss) [1]     398 356 312
Goodwill     607 607  
Disposal Group [Line Items]          
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
LOUISVILLE GAS And ELECTRIC CO [Member]          
Disclosure [Line Items]          
Operating Revenues     1,748 1,648 1,613
Net income (loss)     309 297 [2] 266 [2]
Goodwill     389 389  
Disposal Group [Line Items]          
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
New NGCC LG&E Planned Ownership Percentage 0.31        
LGE [Member]          
Disposal Group [Line Items]          
Expected Capital Cost Of Expansion Project     1,000    
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
KU [Member]          
Disposal Group [Line Items]          
Expected Capital Cost Of Expansion Project     1,000    
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
CPCN NGCC Combustion Turbine Facilities, Power | MW   645      
Rhode Island Energy | Rhode Island Energy TSA          
Disclosure [Line Items]          
Other Nonrecurring (Income) Expense     $ 71 307 262
Rhode Island Energy | Accrual for TSA Markup          
Disclosure [Line Items]          
Other Nonrecurring (Income) Expense       $ 10 $ 7
[1] Net income equals comprehensive income.
[2] Net income equals comprehensive income.