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Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Expense (Benefit)      
Current - Federal $ 46 $ 23 $ (175)
Current - State 53 9 37
Total Current Expense 99 32 (138)
Deferred - Federal 172 137 286
Deferred - State 27 64 48
Total Deferred Expense (Benefit), excluding operating loss carry forwards 199 201 334
Amortization of investment tax credit (3) (3) (3)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Deferred - Federal 1 1 3
Deferred - State (5) (3) (12)
Total Tax Expense (Benefit) of Operating Loss Carryforwards (4) (2) (9)
Total income tax from continuing operations 291 228 184
Income tax expense [Abstract]      
Total income tax expense - Federal 216 158 111
Total income tax expense - State 75 70 73
Total income tax from continuing operations 291 228 184
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract]      
Income tax related to other comprehensive income (6) (8) (14)
Valuation allowance on state deferred taxes recorded to other comprehensive income 0 0 (1)
Total income tax expense (benefits) excluded from income taxes from continuing operations (6) (8) (15)
Reconciliation of Income Tax Expense      
Federal income tax on Income Before Income Taxes at statutory tax rate $ 309 $ 234 $ 194
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 5.00% 6.10% 7.50%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 75 $ 67 $ 69
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent (1.10%) (0.50%) (2.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent (0.10%) (0.50%) (0.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount $ (1) $ (5) $ (7)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (1.20%) (1.00%) (2.80%)
Income tax credits $ (18) $ (10) $ (26)
Amortization of investment tax credit (17) (5) (19)
Amortization of excess deferred federal and state income taxes $ (51) $ (46) $ (48)
Allowance for Funds Used During Construction Equity, Percent (1.30%) (0.90%) (0.70%)
Flow-through rate-making, Percent (0.60%) (1.00%) (0.50%)
Flow-through rate-making $ (10) $ (11) $ (4)
Utility Rate-Making Tax Adjustments (Federal and State), Percent (5.30%) (6.00%) (6.40%)
Utility Rate-Making Tax Adjustments (Federal and State) $ (81) $ (67) $ (58)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.30% 0.30% 0.60%
Other $ 6 $ 4 $ 5
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate, Percent (1.20%) (0.60%) (1.10%)
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate $ (18) $ (6) $ (10)
Total income tax from continuing operations $ 291 $ 228 $ 184
Effective income tax rate 19.80% 20.40% 19.90%
Taxes, other than income      
State gross receipts $ 214 $ 167 $ 195
Domestic property and other 209 207 197
Total 423 374 392
Deferred Tax Assets, Valuation Allowances 184 224  
Renewable Tax Credits Utilized 138 61 250
Renewable Tax Credits Purchased 153 27 300
Allowance for Funds Used During Construction Equity $ (20) $ (10) $ (6)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Amortization Of Excess Deferred Income Taxes, Percent (3.40%) (4.10%) (5.20%)
Proceeds from Income Tax Refunds     $ 55
Income Tax Paid, Federal, after Refund Received $ 66 $ (149) 252
Purchase Price of Transferrable Credits 40 20 282
Refund For The Carry-Back of Acquired Transferrable Tax Credits   200  
PENNSYLVANIA      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received 20 21 24
KENTUCKY      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received 6 4 4
Other States      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received 1 1 1
PPL Electric Utilities Corp [Member]      
Income Tax Expense (Benefit)      
Current - Federal 136 44 91
Current - State 44 4 31
Total Current Expense 180 48 122
Deferred - Federal 17 86 28
Deferred - State 7 42 18
Total Deferred Expense (Benefit), excluding operating loss carry forwards 24 128 46
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Total income tax from continuing operations 204 176 168
Income tax expense [Abstract]      
Total income tax expense - Federal 153 130 119
Total income tax expense - State 51 46 49
Total income tax from continuing operations 204 176 168
Reconciliation of Income Tax Expense      
Federal income tax on Income Before Income Taxes at statutory tax rate $ 177 $ 158 $ 144
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 6.10% 6.20% 7.10%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 52 $ 47 $ 48
Amortization of excess deferred federal and state income taxes $ (10) $ (10) $ (11)
Allowance for Funds Used During Construction Equity, Percent (1.00%) (0.70%) (0.70%)
Flow-through rate-making, Percent (1.20%) (1.50%) (0.70%)
Flow-through rate-making $ (10) $ (11) $ (4)
Utility Rate-Making Tax Adjustments (Federal and State), Percent (3.40%) (3.50%) (3.00%)
Utility Rate-Making Tax Adjustments (Federal and State) $ (28) $ (27) $ (19)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.50% (0.20%) (0.60%)
Other $ 3 $ (2) $ (5)
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate, Percent 3.20% 2.50% 3.50%
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate $ 27 $ 18 $ 24
Total income tax from continuing operations $ 204 $ 176 $ 168
Effective income tax rate 24.20% 23.50% 24.50%
Taxes, other than income      
State gross receipts $ 144 $ 122 $ 136
Domestic property and other 7 9 7
Total 151 131 143
Allowance for Funds Used During Construction Equity $ (8) $ (6) $ (4)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Amortization Of Excess Deferred Income Taxes, Percent (1.20%) (1.30%) (1.60%)
Income Tax Paid, Federal, after Refund Received $ 109 $ 62 $ 68
PPL Electric Utilities Corp [Member] | PENNSYLVANIA      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received 20 21 24
Louisville Gas And Electric Co [Member]      
Income Tax Expense (Benefit)      
Current - Federal 72 60 70
Current - State 14 11 13
Total Current Expense 86 71 83
Deferred - Federal (10) 1 (15)
Deferred - State 3 6 2
Total Deferred Expense (Benefit), excluding operating loss carry forwards (7) 7 (13)
Amortization of investment tax credit (1) (1) (1)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Total income tax from continuing operations 78 77 69
Income tax expense [Abstract]      
Total income tax expense - Federal 61 60 54
Total income tax expense - State 17 17 15
Total income tax from continuing operations 78 77 69
Reconciliation of Income Tax Expense      
Federal income tax on Income Before Income Taxes at statutory tax rate $ 81 $ 79 $ 70
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 3.80% 3.70% 3.80%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 15 $ 14 $ 13
Amortization of excess deferred federal and state income taxes $ (14) $ (13) $ (13)
Allowance for Funds Used During Construction Equity, Percent (1.10%) (0.40%) (0.30%)
Utility Rate-Making Tax Adjustments (Federal and State), Percent (4.60%) (3.80%) (4.20%)
Utility Rate-Making Tax Adjustments (Federal and State) $ (18) $ (15) $ (14)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.00% (0.30%) 0.00%
Other $ 0 $ (1) $ 0
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate, Percent (0.80%) (0.40%) (0.40%)
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate $ (3) $ (2) $ (1)
Total income tax from continuing operations $ 78 $ 77 $ 69
Effective income tax rate 20.20% 20.60% 20.60%
Taxes, other than income      
Domestic property and other $ 51 $ 49 $ 48
Total 51 49 48
Deferred Tax Assets, Valuation Allowances 5 6  
Allowance for Funds Used During Construction Equity $ (4) $ (2) $ (1)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Amortization Of Excess Deferred Income Taxes, Percent (3.50%) (3.40%) (3.90%)
Income Tax Paid, Federal, after Refund Received $ 67 $ 62 $ 71
Louisville Gas And Electric Co [Member] | KENTUCKY      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received 14 11 13
Kentucky Utilities Co [Member]      
Income Tax Expense (Benefit)      
Current - Federal 83 87 73
Current - State 16 17 13
Total Current Expense 99 104 86
Deferred - Federal (4) (15) (11)
Deferred - State 6 2 4
Total Deferred Expense (Benefit), excluding operating loss carry forwards 2 (13) (7)
Amortization of investment tax credit (2) (2) (2)
Tax expense (benefit) of operating loss carryforwards [Abstract]      
Total income tax from continuing operations 99 89 77
Income tax expense [Abstract]      
Total income tax expense - Federal 77 70 60
Total income tax expense - State 22 19 17
Total income tax from continuing operations 99 89 77
Reconciliation of Income Tax Expense      
Federal income tax on Income Before Income Taxes at statutory tax rate $ 104 $ 93 $ 82
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 3.80% 3.70% 3.80%
Increase (decrease) due to:      
State income taxes, net of federal income tax benefit $ 19 $ 16 $ 15
Amortization of excess deferred federal and state income taxes $ (18) $ (17) $ (17)
Allowance for Funds Used During Construction Equity, Percent (1.00%) (0.60%) 0.00%
Utility Rate-Making Tax Adjustments (Federal and State), Percent (4.60%) (4.30%) (4.30%)
Utility Rate-Making Tax Adjustments (Federal and State) $ (23) $ (19) $ (17)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.30%) (0.40%) (0.70%)
Other $ (1) $ (1) $ (3)
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate, Percent (1.10%) (1.00%) (1.20%)
Total Increase (Decrease) to Federal Income Tax On Income Before Income Taxes At Statutory Tax Rate $ (5) $ (4) $ (5)
Total income tax from continuing operations $ 99 $ 89 $ 77
Effective income tax rate 19.90% 20.00% 19.80%
Taxes, other than income      
Domestic property and other $ 51 $ 49 $ 45
Total 51 49 45
Deferred Tax Assets, Valuation Allowances 1 2  
Allowance for Funds Used During Construction Equity $ (5) $ (2) $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Amortization Of Excess Deferred Income Taxes, Percent (3.60%) (3.70%) (4.30%)
Income Tax Paid, Federal, after Refund Received $ 78 $ 85 $ 65
Kentucky Utilities Co [Member] | KENTUCKY      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received 15 16 12
Kentucky Utilities Co [Member] | Other States      
Taxes, other than income      
Income Tax Paid, State and Local, after Refund Received $ 1 $ 1 $ 1