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Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Before Income Taxes (Details) [Abstract] |  |  |
Income from Continuing Operations Before Income Taxes | $ 924 | $ 915 | $ 521
Deferred Tax Assets |  |  |
Deferred investment tax credits | 28 | 29 |
Regulatory liabilities | 123 | 88 |
Income taxes due to customer | 436 | 448 |
Accrued pension and postretirement costs | 101 | 86 |
State loss carryforwards | 253 | 230 |
Contributions in aid of construction | 149 | 114 |
Leases | 139 | 87 |
Valuation allowances | (245) | (213) |
Total deferred tax assets | 1,129 | 1,022 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 3,749 | 3,609 |
Regulatory assets | 376 | 337 |
Prepayments | 47 | 46 |
Goodwill | 22 | 7 |
Domestic - other | 30 | 23 |
Total deferred tax liabilities | 4,224 | 4,022 |
Net deferred tax liability | 3,095 | 3,000 |
Loss carryforwards |  |  |
State loss carryforwards | 253 | 230 |
Deferred tax asset tax credit carryforwards | 67 | 68 |
Deferred Tax Assets, Goodwill and Intangible Assets | 78 | 85 |
Renewable Tax Credits Purchased | 300 |  |
Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 5 |  |
State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 253 |  |
Loss carryforwards |  |  |
Net operating losses | 5,475 |  |
Charitable contributions | 10 |  |
State loss carryforwards | 253 |  |
Charitable contribution carryforwards | 1 |  |
Loss carryforward valuation allowance on net operating losses | (243) |  |
Charitable Contributions Loss Carryforwards valuation allowance | (1) |  |
State [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 1 |  |
Other Noncurrent Assets [Member] |  |  |
Deferred Tax Liabilities |  |  |
Deferred Tax Assets, State Taxes | 9 | 6 |
PPL Electric Utilities Corp [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income from Continuing Operations Before Income Taxes | 687 | 699 | 599
Deferred Tax Assets |  |  |
Regulatory liabilities | 43 | 36 |
Income taxes due to customer | 191 | 193 |
Accrued pension and postretirement costs | 30 | 27 |
Contributions in aid of construction | 105 | 87 |
Leases | 27 | 18 |
Total deferred tax assets | 396 | 361 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,810 | 1,745 |
Regulatory assets | 119 | 93 |
Prepayments | 36 | 35 |
Domestic - other | 4 | 2 |
Total deferred tax liabilities | 1,969 | 1,875 |
Net deferred tax liability | 1,573 | 1,514 |
Louisville Gas And Electric Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income from Continuing Operations Before Income Taxes | 335 | 335 | 303
Deferred Tax Assets |  |  |
Deferred investment tax credits | 8 | 8 |
Regulatory liabilities | 19 | 18 |
Income taxes due to customer | 115 | 119 |
Deferred Tax Assets, Lease Liabilities | 4 | 4 |
Accrued pension and postretirement costs | 3 | 0 |
State tax credit carryforwards | 8 | 9 |
Contributions in aid of construction | 18 | 17 |
Leases | 8 | 8 |
Valuation allowances | (8) | (9) |
Total deferred tax assets | 175 | 174 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 877 | 869 |
Regulatory assets | 67 | 69 |
Lease right-of-use assets | 3 | 3 |
Domestic - other | 4 | 4 |
Total deferred tax liabilities | 951 | 945 |
Net deferred tax liability | 776 | 771 |
Louisville Gas And Electric Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Deferred Tax Assets |  |  |
State tax credit carryforwards | 8 |  |
Valuation allowances | (8) |  |
Kentucky Utilities Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income from Continuing Operations Before Income Taxes | 389 | 398 | $ 363
Deferred Tax Assets |  |  |
Deferred investment tax credits | 21 | 21 |
Regulatory liabilities | 23 | 23 |
Income taxes due to customer | 131 | 136 |
Deferred Tax Assets, Lease Liabilities | 5 | 5 |
State tax credit carryforwards | 4 | 4 |
Contributions in aid of construction | 10 | 9 |
Leases | 5 | 4 |
Valuation allowances | (2) | (3) |
Total deferred tax assets | 197 | 199 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,045 | 1,028 |
Regulatory assets | 50 | 56 |
Accrued pension and postretirement costs | 7 | 6 |
Lease right-of-use assets | 5 | 5 |
Domestic - other | 2 | 0 |
Total deferred tax liabilities | 1,109 | 1,095 |
Net deferred tax liability | 912 | $ 896 |
Kentucky Utilities Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Deferred Tax Assets |  |  |
State tax credit carryforwards | 4 |  |
Valuation allowances | $ (2) |  |

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