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Income Taxes (Tables) | 6 Months Ended
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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 Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
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 benefit | 11 |  |  | 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 Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
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 benefit | 12 |  |  | 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) |
Other | 2 |  |  | 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 Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
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 benefit | 4 |  |  | 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 Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
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 benefit | 2 |  |  | 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 Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
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 benefit | 3 |  |  | 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.

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