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Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | $ 458 | $ 784 | $ 648
Net Increase in Regulatory Liability | (13) | 12 | 59
Deferred Tax Liabilities, Net | 2,768 | 2,438 |
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 | 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 |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Income Tax Expense (Benefit) | 321 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Deemed Dividend [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 397 |  |
Income Tax Expense (Benefit) | 139 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (67) |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (330) |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Foreign Tax Credit [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (157) |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Valuation Of Foreign Tax Credit Carryforward [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 110 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 229 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Income Tax Expense (Benefit) | 321 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Deemed Dividend [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 462 |  |
Income Tax Expense (Benefit) | 161 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (462) |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Foreign Tax Credit [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (205) |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Valuation Of Foreign Tax Credit Carryforward [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 145 |  |
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 220 |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Income Tax Expense (Benefit) | 0 |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Deemed Dividend [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (65) |  |
Income Tax Expense (Benefit) | (22) |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (67) |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 132 |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Foreign Tax Credit [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 48 |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Valuation Of Foreign Tax Credit Carryforward [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (35) |  |
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 9 |  |
PPL Electric Utilities Corp [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 136 | 213 | 212
Net Increase in Regulatory Liability | 19 | 5 | 62
Deferred Tax Liabilities, Net | 1,320 | 1,154 |
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 | 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) |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (107) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (39) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (68) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (13) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (105) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (105) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (13) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (2) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (39) |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 37 |  |
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 0 |  |
LG And E And KU Energy LLC [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 129 | 375 | 257
Net Increase in Regulatory Liability | (32) | 7 | (1)
Deferred Tax Liabilities, Net | 956 | 866 |
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 | 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 |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (60) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (28) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (32) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 110 |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (45) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (45) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 112 |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (15) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (28) |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 13 |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | (2) |  |
Louisville Gas And Electric Co [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 64 | 131 | 126
Net Increase in Regulatory Liability | (5) | 5 | 1
Deferred Tax Liabilities, Net | 628 | 572 |
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 | 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 |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (17) |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 17 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (17) |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 17 |  |
Kentucky Utilities Co [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 76 | 159 | 163
Net Increase in Regulatory Liability | (27) | 2 | $ (2)
Deferred Tax Liabilities, Net | 735 | 691 |
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 | 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 |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (11) |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 11 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | 0 |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | (11) |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member] |  |  |
Tax Reform [Line Items] |  |  |
Taxable Income (Loss) | $ 11 |  |

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