v3.26.1
Utility Rate Regulation - Regulatory Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Regulatory Assets [Line Items]    
Current regulatory assets $ 279 $ 308
Noncurrent regulatory assets 2,148 2,092
Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 20 23
Gas supply clause [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 39 10
Transmission Service Charge [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 61 61
Defined Benefit Plans [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 943 961
Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 109 113
Unamortized Loss On Debt [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 17 18
Terminated Interest Rate Swaps [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 46 47
Accumulated Cost Of Removal Of Utility Plant [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 202 184
Asset Retirement Obligations [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 255 263
Storm Damage costs[Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 50 53
Net metering    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 165 164
Rate adjustment mechanism    
Regulatory Assets [Line Items]    
Current regulatory assets 80 86
Renewable energy certificates    
Regulatory Assets [Line Items]    
Current regulatory assets 23 21
Other    
Regulatory Assets [Line Items]    
Current regulatory assets 26 37
Noncurrent regulatory assets 42 32
Environmental cost recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 99 102
Tax Cuts and Jobs Act (over/under)    
Regulatory Assets [Line Items]    
Current regulatory assets 0 40
Noncurrent regulatory assets 30 0
Gas line Inspections    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 24 24
Advance metering Infrastructure    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 64 67
Retired asset recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 72 76
IT system costs    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 60 18
PPL Electric Utilities Corp [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 54 112
Noncurrent regulatory assets 771 725
PPL Electric Utilities Corp [Member] | Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Gas supply clause [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 471 477
PPL Electric Utilities Corp [Member] | Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 37 42
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 2 2
PPL Electric Utilities Corp [Member] | Terminated Interest Rate Swaps [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 202 184
PPL Electric Utilities Corp [Member] | Asset Retirement Obligations [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Storm Damage costs[Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 50 53
PPL Electric Utilities Corp [Member] | Net metering    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Rate adjustment mechanism    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Renewable energy certificates    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Other    
Regulatory Assets [Line Items]    
Current regulatory assets 4 19
Noncurrent regulatory assets 1 2
PPL Electric Utilities Corp [Member] | Environmental cost recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Tax Cuts and Jobs Act (over/under)    
Regulatory Assets [Line Items]    
Current regulatory assets 0 40
Noncurrent regulatory assets 30 0
PPL Electric Utilities Corp [Member] | Gas line Inspections    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Advance metering Infrastructure    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Retired asset recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | IT system costs    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 28 18
Louisville Gas And Electric Co [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 48 19
Noncurrent regulatory assets 477 482
Louisville Gas And Electric Co [Member] | Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 4 5
Louisville Gas And Electric Co [Member] | Gas supply clause [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 39 10
Louisville Gas And Electric Co [Member] | Transmission Service Charge [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 203 212
Louisville Gas And Electric Co [Member] | Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 22 24
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 8 8
Louisville Gas And Electric Co [Member] | Terminated Interest Rate Swaps [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 27 28
Louisville Gas And Electric Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Asset Retirement Obligations [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 72 73
Louisville Gas And Electric Co [Member] | Storm Damage costs[Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Net metering    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Rate adjustment mechanism    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Renewable energy certificates    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Other    
Regulatory Assets [Line Items]    
Current regulatory assets 9 9
Noncurrent regulatory assets 4 6
Louisville Gas And Electric Co [Member] | Environmental cost recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Tax Cuts and Jobs Act (over/under)    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Noncurrent regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Gas line Inspections    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 22 22
Louisville Gas And Electric Co [Member] | Advance metering Infrastructure    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 27 28
Louisville Gas And Electric Co [Member] | Retired asset recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 72 76
Louisville Gas And Electric Co [Member] | IT system costs    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 16 0
Kentucky Utilities Co [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 1 1
Noncurrent regulatory assets 463 467
Kentucky Utilities Co [Member] | Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 16 18
Kentucky Utilities Co [Member] | Gas supply clause [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Kentucky Utilities Co [Member] | Transmission Service Charge [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 142 144
Kentucky Utilities Co [Member] | Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 34 38
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 5 6
Kentucky Utilities Co [Member] | Terminated Interest Rate Swaps [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 19 19
Kentucky Utilities Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Kentucky Utilities Co [Member] | Asset Retirement Obligations [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 183 190
Kentucky Utilities Co [Member] | Storm Damage costs[Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Kentucky Utilities Co [Member] | Net metering    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Kentucky Utilities Co [Member] | Rate adjustment mechanism    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Kentucky Utilities Co [Member] | Renewable energy certificates    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Kentucky Utilities Co [Member] | Other    
Regulatory Assets [Line Items]    
Current regulatory assets 1 1
Noncurrent regulatory assets 9 11
Kentucky Utilities Co [Member] | Environmental cost recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Kentucky Utilities Co [Member] | Tax Cuts and Jobs Act (over/under)    
Regulatory Assets [Line Items]    
Current regulatory assets 0 0
Noncurrent regulatory assets 0 0
Kentucky Utilities Co [Member] | Gas line Inspections    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 2 2
Kentucky Utilities Co [Member] | Advance metering Infrastructure    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 37 39
Kentucky Utilities Co [Member] | Retired asset recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Kentucky Utilities Co [Member] | IT system costs    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets $ 16 $ 0