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Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit) |  |  |
Current - Federal | $ (19) | $ 6 | $ (14)
Current - State | 17 | 25 | 21
Current - Foreign | 104 | 45 | 80
Total Current Expense | 102 | 76 | 87
Deferred - Federal | 203 | 532 | 385
Deferred - State | 100 | 88 | 89
Deferred - Foreign | 107 | 133 | 86
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 410 | 753 | 560
Amortization of investment tax credit | (3) | (3) | (3)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | (20) | (16) | 25
Deferred - State | (31) | (26) | (21)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | (51) | (42) | 4
Total income tax from continuing operations | 458 | 784 | 648
Income tax expense [Abstract] |  |  |
Total income tax expense - Federal | 161 | 519 | 393
Total income tax expense - State | 86 | 87 | 89
Total income tax expense - Foreign | 211 | 178 | 166
Total income tax from continuing operations | 458 | 784 | 648
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract] |  |  |
Stock-based compensation recorded to Earnings Reinvested | 0 | 0 | (7)
Other comprehensive income | (6) | (34) | (6)
Valuation allowance on state deferred taxes recorded to other comprehensive income | 0 | (1) | 1
Total income tax expense (benefits) excluded from incomes taxes from continuing operations | (6) | (35) | (12)
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 480 | 669 | 893
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | 40 | 46 | 46
Valuation allowance adjustments | 21 | 36 | 16
Impact of lower U.K. income tax rates | (25) | (176) | (177)
U.S. income tax on foreign earnings - net of foreign tax credit | 3 | 47 | (42)
Foreign income return adjustments | 0 | (8) | 2
Impact of the United Kingdom Finance Acts on deferred tax balances | (13) | (16) | (49)
Depreciation and other items not normalized | (11) | (10) | (10)
Amortization of excess deferred federal and state income taxes | (37) | 0 | 0
Interest benefit on United Kingdom financing entities | (17) | (16) | (17)
Stock-based compensation | 4 | (3) | (10)
Deferred tax impact of U.S. tax reform | 0 | 220 | 0
Deferred tax impact of Kentucky tax reform | 9 | 0 | 0
Other | 4 | (5) | (4)
Total increase (decrease) | (22) | 115 | (245)
Total income tax from continuing operations | $ 458 | $ 784 | $ 648
Effective income tax rate | 20.00% | 41.00% | 25.40%
Income Tax Reconciliation Valuation Allowance Foreign Tax Credits |  | $ 23 |
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized | $ 24 | 16 | $ 13
Deferred Income Tax Expense Benefit Statutory Tax Rate Change |  |  | (42)
Deferred Income Tax Expense Benefit Foreign Pension Contribution |  | 35 |
Taxes, other than income |  |  |
State gross receipts | 103 | 102 | 100
State capital stock | 0 | (6) | 0
Foreign property | 134 | 127 | 135
Domestic property and other | 75 | 69 | 66
Total | 312 | 292 | 301
Income Tax Reconciliation Valuation Allowance Foreign Tax Credits |  | 23 |
Tax Cuts And Jobs Act [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Deferred Income Tax Expense (Benefit) Tax Rate Change |  | 220 |
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Total income tax from continuing operations |  | 321 |
Income tax expense [Abstract] |  |  |
Total income tax from continuing operations |  | 321 |
Increase (decrease) due to: |  |  |
Total income tax from continuing operations |  | 321 |
Deferred Income Tax Expense Benefit Tax Reform |  | 83 |
Taxable Deemed Dividend |  | 462 |
Taxes, other than income |  |  |
Deferred Income Tax Expense (Benefit) Net Operating Loss |  | 162 |
Deferred Income Tax Benefit Foreign Tax Credits |  | 60 |
Deferred Tax Assets, Foreign Tax Credit Carryforwards |  | 205 |
Valuation Rollfoward Specific Transaction Additions Foreign Tax Credits |  | 145 |
Credit Carryforward Valuation Allowance Foreign Tax Credits |  | 122 |
Credit Carryforward Expected Realization Foreign Tax Credits |  | 83 |
PPL Electric Utilities Corp [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Current - Federal | 2 | (65) | (29)
Current - State | 9 | 20 | 19
Total Current Expense | 11 | (45) | (10)
Deferred - Federal | 96 | 234 | 193
Deferred - State | 37 | 29 | 29
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 133 | 263 | 222
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | (8) | (5) | 0
Total Tax Expense (Benefit) of Operating Loss Carryforwards | (8) | (5) | 0
Total income tax from continuing operations | 136 | 213 | 212
Income tax expense [Abstract] |  |  |
Total income tax expense - Federal | 90 | 164 | 164
Total income tax expense - State | 46 | 49 | 48
Total income tax from continuing operations | 136 | 213 | 212
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 119 | 201 | 193
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | 43 | 36 | 36
Depreciation and other items not normalized | (11) | (8) | (8)
Amortization of excess deferred federal and state income taxes | (17) | 0 | 0
Stock-based compensation | 1 | (2) | (6)
Deferred tax impact of U.S. tax reform | 0 | (13) | 0
Other | 1 | (1) | (3)
Total increase (decrease) | 17 | 12 | 19
Total income tax from continuing operations | $ 136 | $ 213 | $ 212
Effective income tax rate | 24.00% | 37.00% | 38.40%
Taxes, other than income |  |  |
State gross receipts | $ 103 | $ 102 | $ 100
Domestic property and other | 6 | 5 | 5
Total | 109 | 107 | 105
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Deferred Income Tax Expense (Benefit) Tax Rate Change |  | (13) |
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Total income tax from continuing operations |  | (13) |
Income tax expense [Abstract] |  |  |
Total income tax from continuing operations |  | (13) |
Increase (decrease) due to: |  |  |
Total income tax from continuing operations |  | (13) |
LG And E And KU Energy LLC [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Current - Federal | 31 | 74 | (36)
Current - State | 4 | 6 | 1
Total Current Expense | 35 | 80 | (35)
Deferred - Federal | 65 | 268 | 248
Deferred - State | 34 | 32 | 38
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 99 | 300 | 286
Amortization of investment tax credit | (3) | (3) | (3)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | (2) | (2) | 10
Deferred - State | 0 | 0 | (1)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | (2) | (2) | 9
Total income tax from continuing operations | 129 | 375 | 257
Income tax expense [Abstract] |  |  |
Total income tax expense - Federal | 91 | 337 | 219
Total income tax expense - State | 38 | 38 | 38
Total income tax from continuing operations | 129 | 375 | 257
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract] |  |  |
Other comprehensive income | 5 | (10) | (16)
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 121 | 242 | 240
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | 22 | 26 | 26
Valuation allowance adjustments | (20) | (2) | (1)
Amortization of investment tax credit | (3) | (3) | (3)
Stock-based compensation | 1 | 1 | (3)
Deferred tax impact of U.S. tax reform | 0 | 112 | 0
Deferred tax impact of Kentucky tax reform | 9 | 0 | 0
Other | (1) | (1) | (2)
Total increase (decrease) | 8 | 133 | 17
Total income tax from continuing operations | $ 129 | $ 375 | $ 257
Effective income tax rate | 22.50% | 54.30% | 37.50%
Taxes, other than income |  |  |
Domestic property and other | $ 70 | $ 65 | $ 62
Total | 70 | 65 | 62
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Deferred Income Tax Expense (Benefit) Tax Rate Change |  | 108 |
Deferred Income Tax Expense (Benefit) Expiring Tax Credit |  | 4 |
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Total income tax from continuing operations |  | 112 |
Income tax expense [Abstract] |  |  |
Total income tax from continuing operations |  | 112 |
Increase (decrease) due to: |  |  |
Total income tax from continuing operations |  | 112 |
Deferred Income Tax Expense Benefit Tax Reform |  | 112 |
Louisville Gas And Electric Co [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Current - Federal | 0 | 0 | (22)
Current - State | 4 | 5 | 1
Total Current Expense | 4 | 5 | (21)
Deferred - Federal | 51 | 112 | 134
Deferred - State | 10 | 14 | 18
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 61 | 126 | 152
Amortization of investment tax credit | (1) | (1) | (1)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | 0 | 1 | (4)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | 0 | 1 | (4)
Total income tax from continuing operations | 64 | 131 | 126
Income tax expense [Abstract] |  |  |
Total income tax expense - Federal | 50 | 112 | 107
Total income tax expense - State | 14 | 19 | 19
Total income tax from continuing operations | 64 | 131 | 126
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 62 | 120 | 115
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | 11 | 14 | 12
Amortization of investment tax credit | (1) | (1) | (1)
Amortization of excess deferred federal and state income taxes | (8) | (1) | 0
Other | 0 | (1) | 0
Total increase (decrease) | 2 | 11 | 11
Total income tax from continuing operations | $ 64 | $ 131 | $ 126
Effective income tax rate | 21.50% | 38.10% | 38.30%
Taxes, other than income |  |  |
Domestic property and other | $ 36 | $ 33 | $ 32
Total | 36 | 33 | 32
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Total income tax from continuing operations |  | 0 |
Income tax expense [Abstract] |  |  |
Total income tax from continuing operations |  | 0 |
Increase (decrease) due to: |  |  |
Total income tax from continuing operations |  | 0 |
Kentucky Utilities Co [Member] |  |  |
Income Tax Expense (Benefit) |  |  |
Current - Federal | 22 | 0 | 31
Current - State | 6 | 7 | 5
Total Current Expense | 28 | 7 | 36
Deferred - Federal | 40 | 138 | 131
Deferred - State | 10 | 16 | 19
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 50 | 154 | 150
Amortization of investment tax credit | (2) | (2) | (2)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | 0 | 0 | (21)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | 0 | 0 | (21)
Total income tax from continuing operations | 76 | 159 | 163
Income tax expense [Abstract] |  |  |
Total income tax expense - Federal | 60 | 136 | 139
Total income tax expense - State | 16 | 23 | 24
Total income tax from continuing operations | 76 | 159 | 163
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 76 | 146 | 150
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | 13 | 15 | 16
Amortization of investment tax credit | (2) | (2) | (2)
Amortization of excess deferred federal and state income taxes | (12) | (1) | (1)
Other | 1 | 1 | 0
Total increase (decrease) | 0 | 13 | 13
Total income tax from continuing operations | $ 76 | $ 159 | $ 163
Effective income tax rate | 21.00% | 38.00% | 38.10%
Taxes, other than income |  |  |
Domestic property and other | $ 34 | $ 32 | $ 30
Total | $ 34 | 32 | $ 30
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Total income tax from continuing operations |  | 0 |
Income tax expense [Abstract] |  |  |
Total income tax from continuing operations |  | 0 |
Increase (decrease) due to: |  |  |
Total income tax from continuing operations |  | $ 0 |

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- Definition The component of total income tax expense for the period comprised of the net change during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law specific to operating loss carryforwards. + References No definition available. + Details
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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations related to foreign pension contributions. + References No definition available. + Details
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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations related to the impact of the U.K. statutory income tax rate change. + References No definition available. + Details
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- Definition The component of total income tax expense for the period comprised of the net change in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws specific to operating loss carryforwards. + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the state regulatory treatment of depreciation-related timing differences. + References No definition available. + Details
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- Definition The portion of the difference between deferred income tax expense (benefit) as reported in the Income Statement and the expected deferred income tax expense (benefit) computed attributable to tax reform. + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed attributable to changes in the amount of foreign income tax benefits related to interest expense on intercompany loans for which there was no domestic income tax expense. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported foreign income tax expense (benefit). + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement for the current period and the expected income tax expense (benefit) computed attributable due to the reduction in the future estimated state tax rate that was impacted by a state tax change + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss from continuing operations attributable to the change in valuation allowance results from foreign tax credits. + References No definition available. + Details
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- Definition The component of income tax expense deducted from an entities' federal taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits. + References No definition available. + Details
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- Definition Total income tax expense (benefits) that is not a component of income tax expense from continuing operations on the Statement of Income. + References No definition available. + Details
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- Definition Amount excluded from income taxes from continuing operations related to valuation allowances for state deferred taxes. + References No definition available. + Details
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- Definition Tax expense (benefit) related to stock-based compensation that were recorded to earnings reinvested in excess of par and is not a component of income tax expense from continuing operations on the Statement of Income. + References No definition available. + Details
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- Definition Federal, state, and foreign tax expense (benefits) recorded to other comprehensive income is not a component of income tax expense from continuing operations on the Statement of Income. + References No definition available. + Details
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- Definition Taxable deemed dividend due to a one-time tax that was imposed on unrepatriated accumulated foreign earnings. + References No definition available. + Details
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- Definition The component of taxes, other than income tax for domestic property tax and other taxes not included in other lines. + References No definition available. + Details
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- Definition The component of taxes, other than income expense for foreign property tax. + References No definition available. + Details
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- Definition The component of taxes, other than income expense for state capital stock tax. + References No definition available. + Details
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- Definition The component of taxes, other than income expense for state gross receipts tax. + References No definition available. + Details
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- Definition The total of increases (decreases) to federal income tax on income from continuing operations before income taxes at statutory tax rate. + References No definition available. + Details
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- Definition The amount that was recorded as an addition to tax valuation allowance as a result of expected future utilization of foreign tax credits. + References No definition available. + Details
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