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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income (Loss) from Continuing Operations (Details) [Abstract] |  |  |
Domestic income | $ 874 | $ 1,463 | $ 968
Foreign income | 1,038 | 1,087 | 1,100
Income Before Income Taxes | 1,912 | 2,550 | 2,068
Deferred Tax Assets |  |  |
Deferred investment tax credits | 33 | 51 |
Regulatory liabilities | 62 | 94 |
Income taxes due to customer | 499 | 0 |
Accrued pension costs | 159 | 250 |
Federal loss carryforwards | 356 | 565 |
State loss carryforwards | 409 | 326 |
Federal and state tax credit carryforwards | 455 | 256 |
Foreign capital loss carryforwards | 329 | 302 |
Foreign loss carryforwards | 2 | 3 |
Foreign - pensions | (32) | 41 |
Foreign - regulatory obligations | 2 | 6 |
Foreign - other | 7 | 5 |
Contributions in aid of construction | 134 | 141 |
Domestic - other | 104 | 188 |
Unrealized losses on qualifying derivatives | 10 | 20 |
Valuation allowances | (838) | (593) |
Total deferred tax assets | 1,691 | 1,655 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 3,168 | 4,325 |
Taxes recoverable through future rates | 0 | 170 |
Regulatory assets | 211 | 343 |
Reacquired debt costs | 15 | 25 |
Foreign plant - net | 726 | 640 |
Domestic - other | 9 | 14 |
Total deferred tax liabilities | 4,129 | 5,517 |
Net deferred tax liability | 2,438 | 3,862 |
Loss carryforwards |  |  |
Federal loss carryforwards | 356 | 565 |
Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 349 |  |
Loss carryforwards |  |  |
Net operating losses | 1,662 |  |
Charitable contributions | 36 |  |
Federal loss carryforwards | 349 |  |
Charitable contribution carryforwards | 7 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 407 |  |
Loss carryforwards |  |  |
Net operating losses | 5,512 |  |
Charitable contributions | 26 |  |
Charitable contribution carryforwards | 2 |  |
Loss carryforward valuation allowance on net operating losses | (348) |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
Foreign Tax Authority [Member] |  |  |
Deferred Tax Assets |  |  |
Foreign capital loss carryforwards | 329 |  |
Foreign loss carryforwards | 2 |  |
Loss carryforwards |  |  |
Net operating losses | 10 |  |
Capital losses | 1,938 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Loss carryforward valuation allowance on capital losses | (329) |  |
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 | 27 |
Minimum [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2029 |  |
Expiration - charitable contributions | Dec. 31, 2020 |  |
Minimum [Member] | State [Member] |  |  |
Loss carryforwards |  |  |
Expiration - operating losses | Dec. 31, 2018 |  |
Expiration - charitable contributions | Dec. 31, 2018 |  |
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, 2037 |  |
Expiration - charitable contributions | Dec. 31, 2022 |  |
PPL Electric Utilities Corp [Member] |  |  |
Income (Loss) from Continuing Operations (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 575 | 552 | 416
Deferred Tax Assets |  |  |
Regulatory liabilities | 25 | 34 |
Income taxes due to customer | 193 | 0 |
Accrued pension costs | 63 | 107 |
Federal loss carryforwards | 91 | 147 |
State loss carryforwards | 19 | 22 |
Contributions in aid of construction | 117 | 112 |
Domestic - other | 45 | 81 |
Total deferred tax assets | 553 | 503 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,544 | 2,001 |
Taxes recoverable through future rates | 0 | 141 |
Regulatory assets | 150 | 240 |
Reacquired debt costs | 8 | 15 |
Domestic - other | 5 | 5 |
Total deferred tax liabilities | 1,707 | 2,402 |
Net deferred tax liability | 1,154 | 1,899 |
Loss carryforwards |  |  |
Federal loss carryforwards | 91 | 147 |
PPL Electric Utilities Corp [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 89 |  |
Loss carryforwards |  |  |
Net operating losses | 426 |  |
Charitable contributions | 8 |  |
Federal loss carryforwards | 89 |  |
Charitable contribution carryforwards | 2 |  |
PPL Electric Utilities Corp [Member] | State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 18 |  |
Loss carryforwards |  |  |
Net operating losses | 233 |  |
Charitable contributions | 13 |  |
Charitable contribution carryforwards | $ 1 |  |
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, 2030 |  |
Expiration - charitable contributions | Dec. 31, 2018 |  |
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 (Loss) from Continuing Operations (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 691 | 686 | 603
Deferred Tax Assets |  |  |
Deferred investment tax credits | 33 | 51 |
Regulatory liabilities | 37 | 60 |
Income taxes due to customer | 305 | 15 |
Accrued pension costs | 29 | 58 |
Federal loss carryforwards | 150 | 248 |
State loss carryforwards | 41 | 35 |
Federal and state tax credit carryforwards | 181 | 186 |
Contributions in aid of construction | 17 | 29 |
Domestic - other | 26 | 49 |
Unrealized losses on qualifying derivatives | 7 | 12 |
Valuation allowances | (8) | (11) |
Total deferred tax assets | 818 | 732 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,615 | 2,352 |
Regulatory assets | 61 | 102 |
Domestic - other | 8 | 13 |
Total deferred tax liabilities | 1,684 | 2,467 |
Net deferred tax liability | 866 | 1,735 |
Loss carryforwards |  |  |
Federal loss carryforwards | 150 | 248 |
LG And E And KU Energy LLC [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 150 |  |
Loss carryforwards |  |  |
Net operating losses | 713 |  |
Charitable contributions | 14 |  |
Federal loss carryforwards | 150 |  |
Charitable contribution carryforwards | 3 |  |
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 |  |  |
Federal loss carryforwards | 41 |  |
Loss carryforwards |  |  |
Net operating losses | 874 |  |
Federal loss carryforwards | 41 |  |
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, 2028 |  |
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, 2028 |  |
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, 2037 |  |
Louisville Gas And Electric Co [Member] |  |  |
Income (Loss) from Continuing Operations (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 344 | 329 | 299
Deferred Tax Assets |  |  |
Deferred investment tax credits | 9 | 14 |
Regulatory liabilities | 21 | 34 |
Income taxes due to customer | 142 | 17 |
Federal loss carryforwards | 29 | 80 |
Contributions in aid of construction | 11 | 18 |
Domestic - other | 12 | 17 |
Unrealized losses on qualifying derivatives | 7 | 12 |
Total deferred tax assets | 231 | 192 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 724 | 1,058 |
Regulatory assets | 40 | 65 |
Accrued pension costs | 34 | 35 |
Domestic - other | 5 | 8 |
Total deferred tax liabilities | 803 | 1,166 |
Net deferred tax liability | 572 | 974 |
Loss carryforwards |  |  |
Federal loss carryforwards | 29 | 80 |
Louisville Gas And Electric Co [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Net operating losses | $ 140 |  |
Expiration - operating losses | Dec. 31, 2035 |  |
Kentucky Utilities Co [Member] |  |  |
Income (Loss) from Continuing Operations (Details) [Abstract] |  |  |
Income Before Income Taxes | $ 418 | 428 | $ 374
Deferred Tax Assets |  |  |
Deferred investment tax credits | 24 | 37 |
Regulatory liabilities | 16 | 26 |
Income taxes due to customer | 163 | 0 |
Federal loss carryforwards | 13 | 79 |
Contributions in aid of construction | 6 | 11 |
Domestic - other | 9 | 11 |
Total deferred tax assets | 231 | 164 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 882 | 1,280 |
Regulatory assets | 21 | 37 |
Accrued pension costs | 17 | 12 |
Domestic - other | 2 | 5 |
Total deferred tax liabilities | 922 | 1,334 |
Net deferred tax liability | 691 | 1,170 |
Loss carryforwards |  |  |
Federal loss carryforwards | 13 | $ 79 |
Kentucky Utilities Co [Member] | Federal [Member] |  |  |
Loss carryforwards |  |  |
Net operating losses | $ 61 |  |
Expiration - operating losses | Dec. 31, 2035 |  |

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