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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2020
Income Taxes [Line Items]  
Schedule of Effective Income Tax Rate Reconciliation
Reconciliations of income tax expense (benefit) for the periods ended September 30 are as follows.
(PPL)
Three MonthsNine Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$103 $125 $336 $359 
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit15 13 39 34 
Valuation allowance adjustments7 7 20 21 
Impact of lower U.K. income tax rates2 (6)(18)(20)
Impact of the U.K. Finance Acts on deferred tax balances (a)104 (5)101 (8)
Depreciation and other items not normalized— (2)(4)(5)
Amortization of excess deferred federal and state income taxes (11)(9)(34)(30)
Federal and state income tax return adjustments(9)— (9)1 
Interest benefit on U.K. financing entities(3)(3)(8)(9)
Officers compensation disallowance1 — 5 2 
Kentucky recycling credit, net of federal income tax expense (b)— — — (20)
Other— (2)(5)3 
Total increase (decrease)106 (7)87 (31)
Total income tax expense (benefit)$209 $118 $423 $328 

(a) The U.K. corporation tax rate was scheduled to be reduced from 19% to 17%, effective April 1, 2020. On March 11, 2020, the U.K. Finance Act 2020 included a cancellation of the tax rate reduction to 17%, thereby maintaining the corporation tax rate at 19%. The Finance Act 2020 was formally enacted on July 22, 2020. The primary impact of the cancellation of the corporation tax rate reduction was an increase in deferred tax liabilities and a corresponding deferred tax expense of $106 million.
(b) 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 September 30 are as follows.
(PPL Electric)  
 Three MonthsNine Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$37 $33 $104 $94 
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit14 13 39 36 
Federal and state income tax return adjustments(4)— (4)1 
Depreciation and other items not normalized— (2)(4)(5)
Amortization of excess deferred federal and state income taxes(4)(4)(12)(12)
Other1 — 2 — 
Total increase (decrease)7 7 21 20 
Total income tax expense (benefit)$44 $40 $125 $114 
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 September 30 are as follows.
(LKE)  
 Three MonthsNine Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$35 $42 $92 $98 
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit7 8 17 18 
Amortization of investment tax credit(1)(1)(2)(2)
Valuation allowance adjustments (a)— — — 3 
Amortization of excess deferred federal and state income taxes(7)(5)(20)(17)
Federal and state income tax return adjustments(5)1 (5)1 
Kentucky recycling credit, net of federal income tax expense (a)— — — (20)
Other2 (2)— (3)
Total increase (decrease)(4)1 (10)(20)
Total income tax expense (benefit)$31 $43 $82 $78 

(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 September 30 are as follows.
(LG&E)  
 Three MonthsNine Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$18 $21 $50 $50 
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit3 4 9 9 
Valuation allowance adjustments (a)— — — 15 
Amortization of excess deferred federal and state income taxes(3)(2)(8)(7)
Federal and state income tax return adjustments(2)1 (2)1 
Kentucky recycling credit, net of federal income tax expense (a)— — — (15)
Other— (2)(2)(2)
Total increase (decrease)(2)1 (3)1 
Total income tax expense (benefit)$16 $22 $47 $51 
(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 September 30 are as follows.
(KU)  
 Three MonthsNine Months
 2020201920202019
Federal income tax on Income Before Income Taxes at statutory tax rate - 21%$22 $25 $56 $63 
Increase (decrease) due to:    
State income taxes, net of federal income tax benefit4 5 11 12 
Valuation allowance adjustments (a)— — — 5 
Amortization of excess deferred federal and state income taxes(4)(3)(12)(10)
Federal and state income tax return adjustments(3)— (3)— 
Kentucky recycling credit, net of federal income tax expense (a)— — — (5)
Other— (1)(2)(3)
Total increase (decrease)(3)1 (6)(1)
Total income tax expense (benefit)$19 $26 $50 $62 

(a)During the second quarter of 2019, KU recorded a deferred income tax benefit associated with a project placed into service that prepares a generation waste material for reuse and, as a result, qualifies 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.