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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Before Income Taxes (Details) [Abstract] |  |  |
Income (Loss) from Continuing Operations Before Income Taxes | $ 521 | $ 954 | $ 919
Deferred Tax Assets |  |  |
Deferred investment tax credits | 30 | 30 |
Regulatory liabilities | 94 | 68 |
Income taxes due to customer | 422 | 444 |
Accrued pension and postretirement costs | 75 | 106 |
Federal loss carryforwards | 0 | 234 |
State loss carryforwards | 483 | 448 |
Deferred Tax Assets, Leases | 67 | 68 |
Contributions in aid of construction | 120 | 115 |
Leases | 84 | 68 |
Valuation allowances | (462) | (536) |
Total deferred tax assets | 928 | 1,446 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 3,812 | 3,700 |
Regulatory assets | 180 | 195 |
Domestic - other | 75 | 70 |
Total deferred tax liabilities | 4,067 | 3,965 |
Net deferred tax liability | 3,139 | 2,519 |
Loss carryforwards |  |  |
Federal loss carryforwards | 0 | 234 |
State loss carryforwards | 483 | 448 |
Deferred tax asset tax credit carryforwards | 15 | 401 |
State [Member] |  |  |
Deferred Tax Assets |  |  |
State loss carryforwards | 483 |  |
Loss carryforwards |  |  |
Net operating losses | 6,468 |  |
State loss carryforwards | 483 |  |
Loss carryforward valuation allowance on net operating losses | (459) |  |
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 | 12 | 17 |
PPL Electric Utilities Corp [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income (Loss) from Continuing Operations Before Income Taxes | 599 | 664 | 606
Deferred Tax Assets |  |  |
Regulatory liabilities | 52 | 24 |
Income taxes due to customer | 154 | 162 |
Accrued pension and postretirement costs | 14 | 25 |
Federal loss carryforwards | 0 | 52 |
Contributions in aid of construction | 95 | 91 |
Leases | 21 | 29 |
Total deferred tax assets | 336 | 383 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,891 | 1,826 |
Regulatory assets | 74 | 86 |
Domestic - other | 39 | 30 |
Total deferred tax liabilities | 2,004 | 1,942 |
Net deferred tax liability | 1,668 | 1,559 |
Loss carryforwards |  |  |
Federal loss carryforwards | 0 | 52 |
Louisville Gas And Electric Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income (Loss) from Continuing Operations Before Income Taxes | 303 | 306 | 295
Deferred Tax Assets |  |  |
Deferred investment tax credits | 8 | 8 |
Regulatory liabilities | 18 | 20 |
Income taxes due to customer | 125 | 132 |
Deferred Tax Assets, Lease Liabilities | 4 | 5 |
State tax credit carryforwards | 11 | 12 |
Contributions in aid of construction | 15 | 15 |
Leases | 11 | 11 |
Valuation allowances | (11) | (12) |
Total deferred tax assets | 181 | 191 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 854 | 833 |
Regulatory assets | 65 | 66 |
Lease right-of-use assets | 4 | 4 |
Domestic - other | 9 | 4 |
Total deferred tax liabilities | 932 | 907 |
Net deferred tax liability | 751 | 716 |
Louisville Gas And Electric Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Deferred Tax Assets |  |  |
State tax credit carryforwards | 11 |  |
Valuation allowances | (11) |  |
Kentucky Utilities Co [Member] |  |  |
Income Before Income Taxes (Details) [Abstract] |  |  |
Income (Loss) from Continuing Operations Before Income Taxes | 363 | 343 | $ 372
Deferred Tax Assets |  |  |
Deferred investment tax credits | 22 | 22 |
Regulatory liabilities | 23 | 23 |
Income taxes due to customer | 143 | 150 |
Deferred Tax Assets, Lease Liabilities | 7 | 8 |
State tax credit carryforwards | 4 | 5 |
Contributions in aid of construction | 9 | 8 |
Leases | 4 | 4 |
Valuation allowances | (3) | (4) |
Total deferred tax assets | 209 | 216 |
Deferred Tax Liabilities |  |  |
Domestic plant - net | 1,012 | 992 |
Regulatory assets | 41 | 43 |
Accrued pension and postretirement costs | 13 | 8 |
Lease right-of-use assets | 6 | 7 |
Domestic - other | 2 | 1 |
Total deferred tax liabilities | 1,074 | 1,051 |
Net deferred tax liability | 865 | $ 835 |
Kentucky Utilities Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member] |  |  |
Deferred Tax Assets |  |  |
State tax credit carryforwards | 4 |  |
Valuation allowances | $ (3) |  |

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