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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2020
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income tax expense (benefit) for the periods ended June 30 are as follows.
(PPL)
Three MonthsSix Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$88  $110  $234  $235  
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit11  8  24  21  
Valuation allowance adjustments (a)7  7  13  14  
Impact of lower U.K. income tax rates (9) (6) (20) (14) 
Amortization of excess deferred federal and state income taxes (12) (10) (23) (21) 
Interest benefit on U.K. financing entities(3) (3) (5) (6) 
Kentucky recycling credit, net of federal income tax expense (a)—  (20) —  (20) 
Other(8) (2) (9) 1  
Total increase (decrease)(14) (26) (20) (25) 
Total income tax expense (benefit)$74  $84  $214  $210  
(a) During the second quarter of 2019, LKE recorded a deferred income tax benefit associated with two projects placed into service that prepare a generation waste material for reuse and, as a result, qualify for a Kentucky recycling credit. The applicable credit provides tax benefits for a portion of the equipment costs for major recycling projects in Kentucky. A portion of this amount has been reserved due to insufficient Kentucky taxable income projected at LKE.
PPL Electric Utilities Corp [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation Reconciliations of income tax expense (benefit) for the periods ended June 30 are as follows.
(PPL Electric)  
 Three MonthsSix Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$33  $26  $67  $61  
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit12  10  25  23  
Depreciation and other items not normalized(2) (1) (4) (3) 
Amortization of excess deferred federal and state income taxes(5) (4) (8) (8) 
Other2  1  1  1  
Total increase (decrease)7  6  14  13  
Total income tax expense (benefit)$40  $32  $81  $74  
LG And E And KU Energy LLC [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation Reconciliations of income tax expense (benefit) for the periods ended June 30 are as follows.
(LKE)  
 Three MonthsSix Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$21  $23  $56  $56  
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit4  4  11  10  
Valuation allowance adjustments (a)—  3  —  3  
Amortization of excess deferred federal and state income taxes(6) (6) (13) (12) 
Kentucky recycling credit, net of federal income tax expense (a)—  (20) —  (20) 
Other(2) (1) (3) (2) 
Total increase (decrease)(4) (20) (5) (21) 
Total income tax expense (benefit)$17  $3  $51  $35  

(a)During the second quarter of 2019, LKE recorded a deferred income tax benefit associated with two projects placed into service that prepare a generation waste material for reuse and, as a result, qualify for a Kentucky recycling credit. The applicable credit provides tax benefits for a portion of the equipment costs for major recycling projects in Kentucky. A portion of this amount has been reserved due to insufficient Kentucky taxable income projected at LKE.
Louisville Gas And Electric Co [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation Reconciliations of income tax expense (benefit) for the periods ended June 30 are as follows.
(LG&E)  
 Three MonthsSix Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$12  $12  $32  $29  
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit2  2  6  5  
Valuation allowance adjustments (a)—  15  —  15  
Amortization of excess deferred federal and state income taxes(2) (2) (5) (5) 
Kentucky recycling credit, net of federal income tax expense (a)—  (15) —  (15) 
Other—  —  (2) —  
Total increase (decrease)—  —  (1) —  
Total income tax expense (benefit)$12  $12  $31  $29  
(a)During the second quarter of 2019, LG&E recorded a deferred income tax benefit associated with two projects placed into service that prepare a generation waste material for reuse and, as a result, qualify for a Kentucky recycling credit. The applicable credit provides tax benefits for a portion of the equipment costs for major recycling projects in Kentucky. This amount has been reserved due to insufficient Kentucky taxable income projected at LG&E.
Kentucky Utilities Co [Member]  
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation Reconciliations of income tax expense (benefit) for the periods ended June 30 are as follows.
(KU)  
 Three MonthsSix Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$13  $16  $34  $37  
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit3  3  6  7  
Valuation allowance adjustments (a)—  5  —  5  
Amortization of excess deferred federal and state income taxes(4) (4) (8) (7) 
Kentucky recycling credit, net of federal income tax expense (a)—  (5) —  (5) 
Other(1) (1) (1) (1) 
Total increase (decrease)(2) (2) (3) (1) 
Total income tax expense (benefit)$11  $14  $31  $36  

(a)During the second quarter of 2019, KU recorded a deferred income tax benefit associated with two projects placed into service that prepare a generation waste material for reuse and, as a result, qualify for a Kentucky recycling credit. The applicable credit provides tax benefits for a portion of the equipment costs for major recycling projects in Kentucky. This amount has been reserved due to insufficient Kentucky taxable income projected at KU.