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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Before Income Taxes (Details) [Abstract] |  |  |
Domestic income | $ 964 | $ 1,127 | $ 874
Foreign income | 1,191 | 1,158 | 1,038
Income Before Income Taxes | 2,155 | 2,285 | 1,912
Deferred Tax Assets |  |  |
Deferred investment tax credits | 31 | 31 |
Regulatory liabilities | 75 | 87 |
Income taxes due to customer | 462 | 479 |
Accrued pension and postretirement costs | 211 | 277 |
Federal loss carryforwards | 324 | 325 |
State loss carryforwards | 432 | 419 |
Federal and state tax credit carryforwards | 402 | 392 |
Foreign capital loss carryforwards | 320 | 313 |
Foreign - other | 8 | 10 |
Contributions in aid of construction | 112 | 139 |
Domestic - other | 99 | 88 |
Valuation allowances | (834) | (808) |
Total deferred tax assets | 1,642 | 1,752 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 3,546 | 3,359 |
Regulatory assets | 262 | 314 |
Foreign plant - net | 765 | 724 |
Foreign - pensions | 72 | 83 |
Domestic - other | 61 | 40 |
Total deferred tax liabilities | 4,706 | 4,520 |
Net deferred tax liability | 3,064 | 2,768 |
Loss carryforwards |  |  |
Federal loss carryforwards | 324 | 325 |
State loss carryforwards | 432 | 419 |
Foreign capital loss carryforwards | 320 | 313 |
Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 315 |  |
Loss carryforwards |  |  |
Net operating losses | 1,499 |  |
Charitable contributions | 42 |  |
Federal loss carryforwards | 315 |  |
Charitable contribution carryforwards | 9 |  |
Other Federal Loss Carryforwards | 1 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
Other Loss Carryforward | 7 |  |
Loss Carryforward Valuation Allowance Other | 0 |  |
State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 432 |  |
Loss carryforwards |  |  |
Net operating losses | 5,879 |  |
Charitable contributions | 1 |  |
State loss carryforwards | 432 |  |
Charitable contribution carryforwards | 0 |  |
Loss carryforward valuation allowance on net operating losses | (393) |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
Foreign Tax Authority [Member] |  |  |
Deferred Tax Assets |  |  |
Foreign capital loss carryforwards | 320 |  |
Foreign loss carryforwards | 0 |  |
Loss carryforwards |  |  |
Net operating losses | 3 |  |
Capital losses | 1,880 |  |
Foreign loss carryforwards | 0 |  |
Foreign capital loss carryforwards | 320 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Loss carryforward valuation allowance on capital losses | (320) |  |
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 | 24 | 28 |
PPL Electric Utilities Corp [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 606 | 566 | 575
Deferred Tax Assets |  |  |
Regulatory liabilities | 31 | 35 |
Income taxes due to customer | 170 | 181 |
Accrued pension and postretirement costs | 81 | 110 |
Federal loss carryforwards | 78 | 79 |
State loss carryforwards | 6 | 14 |
Contributions in aid of construction | 88 | 118 |
Domestic - other | 23 | 25 |
Total deferred tax assets | 477 | 562 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,761 | 1,681 |
Regulatory assets | 139 | 176 |
Domestic - other | 24 | 25 |
Total deferred tax liabilities | 1,924 | 1,882 |
Net deferred tax liability | 1,447 | 1,320 |
Loss carryforwards |  |  |
Federal loss carryforwards | 78 | 79 |
State loss carryforwards | 6 | 14 |
PPL Electric Utilities Corp [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 76 |  |
Loss carryforwards |  |  |
Net operating losses | 363 |  |
Charitable contributions | 9 |  |
Federal loss carryforwards | 76 |  |
Charitable contribution carryforwards | 2 |  |
PPL Electric Utilities Corp [Member] | State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 6 |  |
Loss carryforwards |  |  |
Net operating losses | 81 |  |
State loss carryforwards | 6 |  |
LG And E And KU Energy LLC [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 571 | 574 | 691
Deferred Tax Assets |  |  |
Deferred investment tax credits | 31 | 32 |
Regulatory liabilities | 44 | 52 |
Income taxes due to customer | 292 | 299 |
Deferred Tax Assets, Lease Liabilities | 14 | 0 |
Accrued pension and postretirement costs | 71 | 92 |
State tax credit carryforwards | 19 | 1 |
Federal loss carryforwards | 140 | 142 |
State loss carryforwards | 31 | 33 |
Federal and state tax credit carryforwards | 162 | 169 |
Contributions in aid of construction | 23 | 21 |
Domestic - other | 28 | 28 |
Valuation allowances | (6) | (8) |
Total deferred tax assets | 849 | 861 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,778 | 1,671 |
Regulatory assets | 122 | 138 |
Lease right-of-use assets | 12 | 0 |
Domestic - other | 6 | 8 |
Total deferred tax liabilities | 1,918 | 1,817 |
Net deferred tax liability | 1,069 | 956 |
Loss carryforwards |  |  |
Federal loss carryforwards | 140 | 142 |
State loss carryforwards | 31 | 33 |
LG And E And KU Energy LLC [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 140 |  |
Loss carryforwards |  |  |
Net operating losses | 668 |  |
Charitable contributions | 23 |  |
Federal loss carryforwards | 140 |  |
Charitable contribution carryforwards | 5 |  |
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 | 31 |  |
Loss carryforwards |  |  |
Net operating losses | 797 |  |
State loss carryforwards | 31 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Louisville Gas And Electric Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 295 | 297 | 344
Deferred Tax Assets |  |  |
Deferred investment tax credits | 8 | 9 |
Regulatory liabilities | 19 | 24 |
Income taxes due to customer | 136 | 139 |
Deferred Tax Assets, Lease Liabilities | 5 | 0 |
Accrued pension and postretirement costs | 6 | 16 |
State tax credit carryforwards | 14 | 0 |
Contributions in aid of construction | 15 | 14 |
Domestic - other | 10 | 15 |
Valuation allowances | (14) | 0 |
Total deferred tax assets | 199 | 217 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 811 | 751 |
Regulatory assets | 77 | 88 |
Lease right-of-use assets | 4 | 0 |
Domestic - other | 4 | 6 |
Total deferred tax liabilities | 896 | 845 |
Net deferred tax liability | 697 | 628 |
Kentucky Utilities Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 372 | 362 | $ 418
Deferred Tax Assets |  |  |
Deferred investment tax credits | 23 | 23 |
Regulatory liabilities | 25 | 28 |
Income taxes due to customer | 156 | 160 |
Deferred Tax Assets, Lease Liabilities | 8 | 0 |
Accrued pension and postretirement costs | 0 | 7 |
State tax credit carryforwards | 5 | 0 |
Contributions in aid of construction | 8 | 7 |
Domestic - other | 3 | 3 |
Valuation allowances | (4) | 0 |
Total deferred tax assets | 224 | 228 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 959 | 911 |
Regulatory assets | 45 | 50 |
Accrued pension and postretirement costs | 2 | 0 |
Lease right-of-use assets | 7 | 0 |
Domestic - other | 3 | 2 |
Total deferred tax liabilities | 1,016 | 963 |
Net deferred tax liability | $ 792 | $ 735 |

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