v3.26.3
Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Reconciliation of Income Tax Expense [Abstract]        
Federal income tax on Income Before Income Taxes at statutory tax rate $ 95 $ 84 $ 273 $ 240
Increase (decrease) due to: [Abstract]        
State income taxes, net of federal income tax benefit 24 19 63 57
Effective Income Tax Rate Reconciliation, Tax Credit, Amount (6) (3) (13) (8)
Amortization of excess deferred income taxes (14) (13) (40) (36)
Other 0 1 1 2
Total increase (decrease) (9) (4) (23) (11)
Total income tax expense 86 80 250 229
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount (3) (3) (9) (7)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount (3) 0 (4) (1)
Allowance for Funds Used During Construction Equity (8) (5) (21) (14)
Flow-through rate-making (5) (3) (13) (12)
Utility Rate-Making Tax Adjustments (Federal and State) $ (27) $ (21) $ (74) $ (62)
Tax Jurisdiction of Domicile [Extensible Enumeration] UNITED STATES UNITED STATES UNITED STATES UNITED STATES
PPL Electric Utilities Corp [Member]        
Reconciliation of Income Tax Expense [Abstract]        
Federal income tax on Income Before Income Taxes at statutory tax rate $ 52 $ 44 $ 138 $ 132
Increase (decrease) due to: [Abstract]        
State income taxes, net of federal income tax benefit 16 13 40 39
Amortization of excess deferred income taxes (2) (3) (6) (7)
Other (3) 0 (3) (1)
Total increase (decrease) 4 5 11 14
Total income tax expense 56 49 149 146
Allowance for Funds Used During Construction Equity (3) (2) (8) (5)
Flow-through rate-making (4) (3) (12) (12)
Utility Rate-Making Tax Adjustments (Federal and State) (9) (8) (26) (24)
Louisville Gas And Electric Co [Member]        
Reconciliation of Income Tax Expense [Abstract]        
Federal income tax on Income Before Income Taxes at statutory tax rate 27 22 78 64
Increase (decrease) due to: [Abstract]        
State income taxes, net of federal income tax benefit 5 4 14 12
Amortization of excess deferred income taxes (4) (3) (12) (11)
Other 0 (1) 0 (1)
Total increase (decrease) (1) (1) (3) (3)
Total income tax expense 26 21 75 61
Allowance for Funds Used During Construction Equity (2) (1) (5) (3)
Utility Rate-Making Tax Adjustments (Federal and State) (6) (4) (17) (14)
Kentucky Utilities Co [Member]        
Reconciliation of Income Tax Expense [Abstract]        
Federal income tax on Income Before Income Taxes at statutory tax rate 32 29 91 82
Increase (decrease) due to: [Abstract]        
State income taxes, net of federal income tax benefit 6 5 16 15
Amortization of excess deferred income taxes (5) (4) (14) (14)
Other 0 (1) (2) (2)
Total increase (decrease) (1) (1) (5) (4)
Total income tax expense 31 28 86 78
Allowance for Funds Used During Construction Equity (2) (1) (5) (3)
Utility Rate-Making Tax Adjustments (Federal and State) $ (7) $ (5) $ (19) $ (17)