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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Before Income Taxes (Details) [Abstract] |  |  |
Domestic income | $ 902 | $ 964 | $ 1,127
Foreign income | 1,069 | 1,191 | 1,158
Income Before Income Taxes | 1,971 | 2,155 | 2,285
Deferred Tax Assets |  |  |
Deferred investment tax credits | 30 | 31 |
Regulatory liabilities | 68 | 75 |
Income taxes due to customer | 444 | 462 |
Accrued pension and postretirement costs | 106 | 211 |
Federal loss carryforwards | 234 | 324 |
State loss carryforwards | 448 | 432 |
Foreign capital loss carryforwards | 370 | 320 |
Foreign - other | 6 | 8 |
Contributions in aid of construction | 115 | 112 |
Domestic - other | 136 | 99 |
Valuation allowances | (906) | (834) |
Total deferred tax assets | 1,452 | 1,642 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 3,700 | 3,546 |
Regulatory assets | 195 | 262 |
Foreign plant - net | 911 | 765 |
Foreign - pensions | 127 | 72 |
Domestic - other | 70 | 61 |
Total deferred tax liabilities | 5,003 | 4,706 |
Net deferred tax liability | 3,551 | 3,064 |
Loss carryforwards |  |  |
Federal loss carryforwards | 234 | 324 |
State loss carryforwards | 448 | 432 |
Foreign capital loss carryforwards | 370 | 320 |
Deferred tax asset credit carryforwards | 401 | 402 |
Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 234 |  |
Loss carryforwards |  |  |
Net operating losses | 1,111 |  |
Federal loss carryforwards | 234 |  |
Other Federal Loss Carryforwards | 2 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Other Loss Carryforward | 13 |  |
Loss Carryforward Valuation Allowance Other | 0 |  |
Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset credit carryforwards | 32 |  |
State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 448 |  |
Loss carryforwards |  |  |
Net operating losses | 6,032 |  |
State loss carryforwards | 448 |  |
Other Federal Loss Carryforwards | 0 |  |
Loss carryforward valuation allowance on net operating losses | (419) |  |
Other Loss Carryforward | 2 |  |
Loss Carryforward Valuation Allowance Other | 0 |  |
State [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset credit carryforwards | 1 |  |
Foreign Tax Authority [Member] |  |  |
Deferred Tax Assets |  |  |
Foreign capital loss carryforwards | 370 |  |
Loss carryforwards |  |  |
Capital losses | 1,945 |  |
Foreign capital loss carryforwards | 370 |  |
Loss carryforward valuation allowance on capital losses | (370) |  |
Deferred Tax Assets, Capital Loss Carryforwards, U.K. Finance Act 2020 | 106 |  |
Other Noncurrent Assets [Member] |  |  |
Deferred Tax Liabilities |  |  |
Deferred Tax Assets, State Taxes | 17 | 24 |
PPL Electric Utilities Corp [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 664 | 606 | 566
Deferred Tax Assets |  |  |
Regulatory liabilities | 24 | 31 |
Income taxes due to customer | 162 | 170 |
Accrued pension and postretirement costs | 25 | 81 |
Federal loss carryforwards | 52 | 78 |
State loss carryforwards | 0 | 6 |
Contributions in aid of construction | 91 | 88 |
Domestic - other | 29 | 23 |
Total deferred tax assets | 383 | 477 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,826 | 1,761 |
Regulatory assets | 86 | 139 |
Domestic - other | 30 | 24 |
Total deferred tax liabilities | 1,942 | 1,924 |
Net deferred tax liability | 1,559 | 1,447 |
Loss carryforwards |  |  |
Federal loss carryforwards | 52 | 78 |
State loss carryforwards | 0 | 6 |
PPL Electric Utilities Corp [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 52 |  |
Loss carryforwards |  |  |
Net operating losses | 248 |  |
Federal loss carryforwards | 52 |  |
PPL Electric Utilities Corp [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset credit carryforwards | 5 |  |
LG And E And KU Energy LLC [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 556 | 571 | 574
Deferred Tax Assets |  |  |
Deferred investment tax credits | 30 | 31 |
Regulatory liabilities | 43 | 44 |
Income taxes due to customer | 282 | 292 |
Deferred Tax Assets, Lease Liabilities | 13 | 14 |
Accrued pension and postretirement costs | 57 | 71 |
State tax credit carryforwards | 17 | 19 |
Federal loss carryforwards | 107 | 140 |
State loss carryforwards | 28 | 31 |
Contributions in aid of construction | 23 | 23 |
Domestic - other | 29 | 28 |
Valuation allowances | (4) | (6) |
Total deferred tax assets | 784 | 849 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,831 | 1,778 |
Regulatory assets | 109 | 122 |
Lease right-of-use assets | 11 | 12 |
Domestic - other | 8 | 6 |
Total deferred tax liabilities | 1,959 | 1,918 |
Net deferred tax liability | 1,175 | 1,069 |
Loss carryforwards |  |  |
Federal loss carryforwards | 107 | 140 |
State loss carryforwards | 28 | 31 |
Deferred tax asset credit carryforwards | 159 | 162 |
LG And E And KU Energy LLC [Member] | Federal [Member] |  |  |
Deferred Tax Assets |  |  |
Federal loss carryforwards | 107 |  |
Loss carryforwards |  |  |
Net operating losses | 511 |  |
Charitable contributions | 1 |  |
Federal loss carryforwards | 107 |  |
Charitable contribution carryforwards | 0 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
Charitable Contributions Loss Carryforwards valuation allowance | 0 |  |
LG And E And KU Energy LLC [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset credit carryforwards | 25 |  |
LG And E And KU Energy LLC [Member] | State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 28 |  |
Loss carryforwards |  |  |
Net operating losses | 710 |  |
State loss carryforwards | 28 |  |
Loss carryforward valuation allowance on net operating losses | 0 |  |
LG And E And KU Energy LLC [Member] | State [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Loss carryforwards |  |  |
Deferred tax asset credit carryforwards | 1 |  |
Louisville Gas And Electric Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 306 | 295 | 297
Deferred Tax Assets |  |  |
Deferred investment tax credits | 8 | 8 |
Regulatory liabilities | 20 | 19 |
Income taxes due to customer | 132 | 136 |
Deferred Tax Assets, Lease Liabilities | 5 | 5 |
Accrued pension and postretirement costs | 0 | 6 |
State tax credit carryforwards | 12 | 14 |
Contributions in aid of construction | 15 | 15 |
Domestic - other | 11 | 10 |
Valuation allowances | (12) | (14) |
Total deferred tax assets | 191 | 199 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 833 | 811 |
Regulatory assets | 66 | 77 |
Lease right-of-use assets | 4 | 4 |
Domestic - other | 4 | 4 |
Total deferred tax liabilities | 907 | 896 |
Net deferred tax liability | 716 | 697 |
Louisville Gas And Electric Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Deferred Tax Assets |  |  |
State tax credit carryforwards | 12 |  |
Valuation allowances | (12) |  |
Kentucky Utilities Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income Before Income Taxes | 343 | 372 | $ 362
Deferred Tax Assets |  |  |
Deferred investment tax credits | 22 | 23 |
Regulatory liabilities | 23 | 25 |
Income taxes due to customer | 150 | 156 |
Deferred Tax Assets, Lease Liabilities | 8 | 8 |
State tax credit carryforwards | 5 | 5 |
Contributions in aid of construction | 8 | 8 |
Domestic - other | 4 | 3 |
Valuation allowances | (4) | (4) |
Total deferred tax assets | 216 | 224 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 992 | 959 |
Regulatory assets | 43 | 45 |
Accrued pension and postretirement costs | 8 | 2 |
Lease right-of-use assets | 7 | 7 |
Domestic - other | 1 | 3 |
Total deferred tax liabilities | 1,051 | 1,016 |
Net deferred tax liability | 835 | $ 792 |
Kentucky Utilities Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Deferred Tax Assets |  |  |
State tax credit carryforwards | 5 |  |
Valuation allowances | $ (4) |  |

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