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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Before Income Taxes (Details) [Abstract] |  |  |
Domestic income | $ 1,127 | $ 874 | $ 1,463
Foreign income | 1,158 | 1,038 | 1,087
Income Before Income Taxes | 2,285 | 1,912 | 2,550
Deferred Tax Assets |  |  |
Deferred investment tax credits | 31 | 33 |
Regulatory liabilities | 87 | 68 |
Income taxes due to customer | 479 | 499 |
Accrued pension and postretirement costs | 277 | 232 |
Federal loss carryforwards | 325 | 356 |
State loss carryforwards | 419 | 409 |
Federal and state tax credit carryforwards | 392 | 455 |
Foreign capital loss carryforwards | 313 | 329 |
Foreign loss carryforwards | 1 | 2 |
Foreign - regulatory obligations | 0 | 2 |
Foreign - other | 9 | 7 |
Contributions in aid of construction | 139 | 134 |
Domestic - other | 81 | 102 |
Unrealized losses on qualifying derivatives | 7 | 10 |
Valuation allowances | (808) | (838) |
Total deferred tax assets | 1,752 | 1,800 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 3,359 | 3,168 |
Regulatory assets | 314 | 288 |
Reacquired debt costs | 12 | 15 |
Foreign plant - net | 724 | 726 |
Foreign - pensions | 83 | 32 |
Domestic - other | 28 | 9 |
Total deferred tax liabilities | 4,520 | 4,238 |
Net deferred tax liability | 2,768 | 2,438 |
Loss carryforwards |  |  |
Federal loss carryforwards | 325 | 356 |
State loss carryforwards | 419 | 409 |
Foreign loss carryforwards | 1 | 2 |
Foreign capital loss carryforwards | 313 | 329 |
Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 319 |  |
Loss carryforwards |  |  |
Net operating losses | 1,519 |  |
Charitable contributions | 29 |  |
Federal loss carryforwards | 319 |  |
Charitable contribution carryforwards | 6 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 418 |  |
Loss carryforwards |  |  |
Net operating losses | 5,725 |  |
Charitable contributions | 7 |  |
State loss carryforwards | 418 |  |
Charitable contribution carryforwards | 1 |  |
Loss carryforward valuation allowance on net operating losses | (370) |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
Foreign Tax Authority [Member] |  |  |
Deferred Tax Assets |  |  |
Foreign capital loss carryforwards | 313 |  |
Foreign loss carryforwards | 1 |  |
Loss carryforwards |  |  |
Net operating losses | 6 |  |
Capital losses | 1,842 |  |
Foreign loss carryforwards | 1 |  |
Foreign capital loss carryforwards | 313 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Loss carryforward valuation allowance on capital losses | (313) |  |
Tax Cuts And Jobs Act [Member] |  |  |
Deferred Tax Liabilities |  |  |
Net deferred tax liability |  | 101 |
Other Noncurrent Assets [Member] |  |  |
Deferred Tax Liabilities |  |  |
Deferred Tax Assets, State Taxes | $ 28 | 24 |
Minimum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2031 |  |
Expiration - charitable contributions | Dec. 31, 2020 |  |
Minimum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2019 |  |
Expiration - charitable contributions | Dec. 31, 2020 |  |
Maximum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2037 |  |
Expiration - charitable contributions | Dec. 31, 2022 |  |
Maximum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2038 |  |
Expiration - charitable contributions | Dec. 31, 2022 |  |
PPL Electric Utilities Corp [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 566 | 575 | 552
Deferred Tax Assets |  |  |
Regulatory liabilities | 35 | 25 |
Income taxes due to customer | 181 | 193 |
Accrued pension and postretirement costs | 110 | 81 |
Federal loss carryforwards | 79 | 91 |
State loss carryforwards | 14 | 19 |
Contributions in aid of construction | 118 | 117 |
Domestic - other | 25 | 27 |
Total deferred tax assets | 562 | 553 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,681 | 1,544 |
Regulatory assets | 176 | 150 |
Reacquired debt costs | 6 | 8 |
Domestic - other | 19 | 5 |
Total deferred tax liabilities | 1,882 | 1,707 |
Net deferred tax liability | 1,320 | 1,154 |
Loss carryforwards |  |  |
Federal loss carryforwards | 79 | 91 |
State loss carryforwards | 14 | 19 |
PPL Electric Utilities Corp [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 78 |  |
Loss carryforwards |  |  |
Net operating losses | 370 |  |
Charitable contributions | 6 |  |
Federal loss carryforwards | 78 |  |
Charitable contribution carryforwards | 1 |  |
PPL Electric Utilities Corp [Member] | State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 14 |  |
Loss carryforwards |  |  |
Net operating losses | 180 |  |
Charitable contributions | 5 |  |
State loss carryforwards | 14 |  |
Charitable contribution carryforwards | $ 0 |  |
PPL Electric Utilities Corp [Member] | Minimum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2031 |  |
Expiration - charitable contributions | Dec. 31, 2020 |  |
PPL Electric Utilities Corp [Member] | Minimum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2031 |  |
Expiration - charitable contributions | Dec. 31, 2020 |  |
PPL Electric Utilities Corp [Member] | Maximum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2037 |  |
Expiration - charitable contributions | Dec. 31, 2022 |  |
PPL Electric Utilities Corp [Member] | Maximum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2032 |  |
Expiration - charitable contributions | Dec. 31, 2022 |  |
LG And E And KU Energy LLC [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 574 | 691 | 686
Deferred Tax Assets |  |  |
Deferred investment tax credits | 32 | 33 |
Regulatory liabilities | 52 | 43 |
Income taxes due to customer | 299 | 305 |
Accrued pension and postretirement costs | 92 | 100 |
Federal loss carryforwards | 142 | 150 |
State loss carryforwards | 33 | 41 |
Federal and state tax credit carryforwards | 169 | 181 |
Contributions in aid of construction | 21 | 17 |
Domestic - other | 29 | 33 |
Valuation allowances | (8) | (8) |
Total deferred tax assets | 861 | 895 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,671 | 1,615 |
Regulatory assets | 138 | 138 |
Domestic - other | 8 | 8 |
Total deferred tax liabilities | 1,817 | 1,761 |
Net deferred tax liability | 956 | 866 |
Loss carryforwards |  |  |
Federal loss carryforwards | 142 | 150 |
State loss carryforwards | 33 | 41 |
LG And E And KU Energy LLC [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 142 |  |
Loss carryforwards |  |  |
Net operating losses | 674 |  |
Charitable contributions | 11 |  |
Federal loss carryforwards | 142 |  |
Charitable contribution carryforwards | 2 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
LG And E And KU Energy LLC [Member] | State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 33 |  |
Loss carryforwards |  |  |
Net operating losses | 848 |  |
State loss carryforwards | 33 |  |
Loss carryforward valuation allowance on net operating losses | $ 0 |  |
LG And E And KU Energy LLC [Member] | Minimum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2031 |  |
Expiration - charitable contributions | Dec. 31, 2020 |  |
LG And E And KU Energy LLC [Member] | Minimum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2029 |  |
LG And E And KU Energy LLC [Member] | Maximum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2037 |  |
Expiration - charitable contributions | Dec. 31, 2022 |  |
LG And E And KU Energy LLC [Member] | Maximum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2038 |  |
Louisville Gas And Electric Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 297 | 344 | 329
Deferred Tax Assets |  |  |
Deferred investment tax credits | 9 | 9 |
Regulatory liabilities | 24 | 21 |
Income taxes due to customer | 139 | 142 |
Accrued pension and postretirement costs | 16 | 14 |
Federal loss carryforwards | 0 | 29 |
Contributions in aid of construction | 14 | 11 |
Domestic - other | 15 | 19 |
Total deferred tax assets | 217 | 245 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 751 | 724 |
Regulatory assets | 88 | 88 |
Domestic - other | 6 | 5 |
Total deferred tax liabilities | 845 | 817 |
Net deferred tax liability | 628 | 572 |
Loss carryforwards |  |  |
Federal loss carryforwards | 0 | 29 |
Kentucky Utilities Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 362 | 418 | $ 428
Deferred Tax Assets |  |  |
Deferred investment tax credits | 23 | 24 |
Regulatory liabilities | 28 | 22 |
Income taxes due to customer | 160 | 163 |
Accrued pension and postretirement costs | 7 | 7 |
Federal loss carryforwards | 0 | 13 |
Contributions in aid of construction | 7 | 6 |
Domestic - other | 3 | 8 |
Total deferred tax assets | 228 | 243 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 911 | 882 |
Regulatory assets | 50 | 50 |
Domestic - other | 2 | 2 |
Total deferred tax liabilities | 963 | 934 |
Net deferred tax liability | 735 | 691 |
Loss carryforwards |  |  |
Federal loss carryforwards | $ 0 | $ 13 |

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