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Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | $ 784 | $ 648 | $ 465
Net Increase in Regulatory Liability | 12 | 59 | (42)
Deferred Tax Liabilities, Net | 2,438 | 3,862 |
Tax Cuts And Jobs Act [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Deemed Dividend | 462 |  |
Income Tax Expense (Benefit) | 321 |  |
Net Increase in Regulatory Liability | 2,185 |  |
Deferred Tax Liabilities, Net | 101 |  |
Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 220 |  |
PPL Electric Utilities Corp [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 213 | 212 | 164
Net Increase in Regulatory Liability | 5 | 62 | (35)
Deferred Tax Liabilities, Net | 1,154 | 1,899 |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (13) |  |
Net Increase in Regulatory Liability | 1,019 |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (13) |  |
LG And E And KU Energy LLC [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 375 | 257 | 239
Deferred Tax Liabilities, Net | 866 | 1,735 |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 112 |  |
Net Increase in Regulatory Liability | 1,166 |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 112 |  |
Louisville Gas And Electric Co [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 131 | 126 | 114
Deferred Tax Liabilities, Net | 572 | 974 |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 0 |  |
Net Increase in Regulatory Liability | 532 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 0 |  |
Kentucky Utilities Co [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 159 | 163 | $ 140
Deferred Tax Liabilities, Net | 691 | $ 1,170 |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 0 |  |
Net Increase in Regulatory Liability | 634 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | $ 0 |  |

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