v3.26.3
Utility Rate Regulation - Regulatory Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Regulatory Assets [Line Items]    
Current regulatory assets $ 312 $ 308
Noncurrent regulatory assets 2,190 2,092
Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 17 23
Gas supply clause [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 35 10
Transmission Service Charge [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 57 61
Defined Benefit Plans [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 935 961
Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 123 113
Unamortized Loss On Debt [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 16 18
Terminated Interest Rate Swaps [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 45 47
Accumulated Cost Of Removal Of Utility Plant [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 218 184
Asset Retirement Obligations [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 245 263
Storm Damage costs[Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 72 53
Net metering    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 170 164
Rate adjustment mechanism    
Regulatory Assets [Line Items]    
Current regulatory assets 88 86
Renewable energy certificates    
Regulatory Assets [Line Items]    
Current regulatory assets 31 21
Derivative Instruments [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 18 3
Other    
Regulatory Assets [Line Items]    
Current regulatory assets 29 37
Noncurrent regulatory assets 41 29
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 29 0
Gas line Inspections    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 23 24
Advance metering Infrastructure    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 64 67
Retired asset recovery    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 69 76
IT system costs    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 78 18
PPL Electric Utilities Corp [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 84 112
Noncurrent regulatory assets 808 725
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 469 477
PPL Electric Utilities Corp [Member] | Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 52 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 218 184
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 72 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] | Derivative Instruments [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
PPL Electric Utilities Corp [Member] | Other    
Regulatory Assets [Line Items]    
Current regulatory assets 12 19
Noncurrent regulatory assets 2 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 29 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 36 18
Louisville Gas And Electric Co [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 42 19
Noncurrent regulatory assets 474 482
Louisville Gas And Electric Co [Member] | Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 3 5
Louisville Gas And Electric Co [Member] | Gas supply clause [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 35 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 201 212
Louisville Gas And Electric Co [Member] | Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 21 24
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 7 8
Louisville Gas And Electric Co [Member] | Terminated Interest Rate Swaps [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 26 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 69 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] | Derivative Instruments [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Louisville Gas And Electric Co [Member] | Other    
Regulatory Assets [Line Items]    
Current regulatory assets 7 9
Noncurrent regulatory assets 10 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 21 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 69 76
Louisville Gas And Electric Co [Member] | IT system costs    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 20 0
Kentucky Utilities Co [Member]    
Regulatory Assets [Line Items]    
Current regulatory assets 0 1
Noncurrent regulatory assets 455 467
Kentucky Utilities Co [Member] | Plant outage costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 14 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 140 144
Kentucky Utilities Co [Member] | Storm Costs [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 33 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 176 190
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] | Derivative Instruments [Member]    
Regulatory Assets [Line Items]    
Noncurrent regulatory assets 0 0
Kentucky Utilities Co [Member] | Other    
Regulatory Assets [Line Items]    
Current regulatory assets 0 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 $ 20 $ 0