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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit) |  |  |
Current - Federal | $ 6 | $ (14) | $ (26)
Current - State | 25 | 21 | 25
Current - Foreign | 45 | 80 | 89
Total Current Expense (Benefit) | 76 | 87 | 88
Deferred - Federal | 532 | 385 | 699
Deferred - State | 88 | 89 | 68
Deferred - Foreign | 133 | 86 | 41
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 753 | 560 | 808
Amortization of investment tax credit - Federal | (3) | (3) | (4)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | (16) | 25 | (396)
Deferred - State | (26) | (21) | (31)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | (42) | 4 | (427)
Total income tax from continuing operations | 784 | 648 | 465
Income tax expense (benefit) from continuing operations [Abstract] |  |  |
Total income tax expense - Federal | 519 | 393 | 273
Total income tax expense - State | 87 | 89 | 62
Total income tax expense - Foreign | 178 | 166 | 130
Total income tax from continuing operations | 784 | 648 | 465
Discontinued operations | 0 | 0 | (30)
Stock-based compensation recorded to Earnings Reinvested | 0 | (7) | 0
Other comprehensive income | (34) | (6) | (2)
Valuation allowance on state deferred taxes recorded to other comprehensive income | (1) | 1 | (4)
Total income tax expense (benefits) excluded from incomes taxes from continuing operations | (35) | (12) | (36)
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% | $ 669 | $ 893 | $ 724
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | $ 46 | $ 46 | $ 31
Valuation allowance adjustments | 36 | 16 | 24
Stock-based compensation | (3) | (10) | 0
Deferred tax impact of U.S. tax reform | 220 | 0 | 0
Impact of lower U.K. income tax rates | (176) | (177) | (176)
U.S. income tax on foreign earnings - net of foreign tax credit | 47 | (42) | 8
Federal and state tax reserve adjustments | 0 | 0 | (22)
Foreign income return adjustments | (8) | 2 | 0
Impact of the United Kingdom Finance Acts on deferred tax balances | (16) | (49) | (91)
Depreciation not normalized | (10) | (10) | (5)
Interest benefit on United Kingdom financing entities | (16) | (17) | (20)
Other | (5) | (4) | (8)
Total increase (decrease) | 115 | (245) | (259)
Total income tax from continuing operations | $ 784 | $ 648 | $ 465
Effective income tax rate | 41.00% | 25.40% | 22.50%
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized | $ 16 | $ 13 | $ 12
Expense related to federal tax credit carryforwards that are expected to expire as a result of future taxable earnings |  |  | 12
Benefit recorded in continuing operations related to the settlement of the IRS audit for tax years 1998-2011 |  |  | 12
Benefit recorded in continuing operations related to the planned amendment of a prior period tax return. |  |  | (9)
Deferred Income Tax Expense Benefit Statutory Tax Rate Change |  | 42 | 90
Deferred Income Tax Expense Benefit Foreign Pension Contribution | 35 |  |
Taxes, other than income |  |  |
State gross receipts | 102 | 100 | 89
State capital stock | (6) | 0 | 0
Foreign property | 127 | 135 | 148
Domestic property and other | 69 | 66 | 62
Total | 292 | 301 | 299
Previously recorded reserves |  |  | 17
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 (benefit) from continuing operations [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 | (65) | (29) | (80)
Current - State | 20 | 19 | 23
Total Current Expense (Benefit) | (45) | (10) | (57)
Deferred - Federal | 234 | 193 | 287
Deferred - State | 29 | 29 | 12
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 263 | 222 | 299
Amortization of investment tax credit - Federal | 0 | 0 | 0
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | (5) | 0 | (75)
Deferred - State | 0 | 0 | (3)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | (5) | 0 | (78)
Total income tax from continuing operations | 213 | 212 | 164
Income tax expense (benefit) from continuing operations [Abstract] |  |  |
Total income tax expense - Federal | 164 | 164 | 132
Total income tax expense - State | 49 | 48 | 32
Total income tax from continuing operations | 213 | 212 | 164
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% | $ 201 | $ 193 | $ 146
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | $ 36 | $ 36 | $ 25
Stock-based compensation | (2) | (6) | 0
Deferred tax impact of U.S. tax reform | (13) | 0 | 0
Depreciation not normalized | (8) | (8) | (4)
Other | (1) | (3) | (3)
Total increase (decrease) | 12 | 19 | 18
Total income tax from continuing operations | $ 213 | $ 212 | $ 164
Effective income tax rate | 37.00% | 38.40% | 39.40%
Taxes, other than income |  |  |
State gross receipts | $ 102 | $ 100 | $ 89
Domestic property and other | 5 | 5 | 5
Total | 107 | 105 | 94
Previously recorded reserves |  |  | 17
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 (benefit) from continuing operations [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 | 74 | (36) | 2
Current - State | 6 | 1 | 1
Total Current Expense (Benefit) | 80 | (35) | 3
Deferred - Federal | 268 | 248 | 405
Deferred - State | 32 | 38 | 32
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 300 | 286 | 437
Amortization of investment tax credit - Federal | (3) | (3) | (3)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | (2) | 10 | (198)
Deferred - State | 0 | (1) | 0
Total Tax Expense (Benefit) of Operating Loss Carryforwards | (2) | 9 | (198)
Total income tax from continuing operations | 375 | 257 | 239
Income tax expense (benefit) from continuing operations [Abstract] |  |  |
Total income tax expense - Federal | 337 | 219 | 206
Total income tax expense - State | 38 | 38 | 33
Total income tax from continuing operations | 375 | 257 | 239
Other comprehensive income | (10) | (16) | (1)
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% | $ 242 | $ 240 | $ 211
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | $ 25 | $ 25 | $ 22
Valuation allowance adjustments | 0 | 0 | 12
Stock-based compensation | 1 | (3) | 0
Deferred tax impact of U.S. tax reform | 112 | 0 | 0
Amortization of investment tax credit | (3) | (3) | (3)
Other | (2) | (2) | (3)
Total increase (decrease) | 133 | 17 | 28
Total income tax from continuing operations | $ 375 | $ 257 | $ 239
Effective income tax rate | 54.30% | 37.50% | 39.60%
Taxes, other than income |  |  |
Domestic property and other | $ 65 | $ 62 | $ 57
Total | 65 | 62 | 57
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 (benefit) from continuing operations [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 | (22) | (15)
Current - State | 5 | 1 | 3
Total Current Expense (Benefit) | 5 | (21) | (12)
Deferred - Federal | 112 | 134 | 190
Deferred - State | 14 | 18 | 13
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 126 | 152 | 203
Amortization of investment tax credit - Federal | (1) | (1) | (1)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | 1 | (4) | (76)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | 1 | (4) | (76)
Total income tax from continuing operations | 131 | 126 | 114
Income tax expense (benefit) from continuing operations [Abstract] |  |  |
Total income tax expense - Federal | 112 | 107 | 98
Total income tax expense - State | 19 | 19 | 16
Total income tax from continuing operations | 131 | 126 | 114
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% | $ 120 | $ 115 | $ 105
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | $ 13 | $ 12 | $ 11
Amortization of investment tax credit | (1) | (1) | (1)
Other | (1) | 0 | (1)
Total increase (decrease) | 11 | 11 | 9
Total income tax from continuing operations | $ 131 | $ 126 | $ 114
Effective income tax rate | 38.10% | 38.30% | 38.10%
Taxes, other than income |  |  |
Domestic property and other | $ 33 | $ 32 | $ 28
Total | 33 | 32 | 28
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 (benefit) from continuing operations [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 | 0 | 31 | (21)
Current - State | 7 | 5 | 1
Total Current Expense (Benefit) | 7 | 36 | (20)
Deferred - Federal | 138 | 131 | 240
Deferred - State | 16 | 19 | 19
Total Deferred Expense (Benefit), excluding operating loss carry forwards | 154 | 150 | 259
Amortization of investment tax credit - Federal | (2) | (2) | (2)
Tax expense (benefit) of operating loss carryforwards [Abstract] |  |  |
Deferred - Federal | 0 | (21) | (97)
Total Tax Expense (Benefit) of Operating Loss Carryforwards | 0 | (21) | (97)
Total income tax from continuing operations | 159 | 163 | 140
Income tax expense (benefit) from continuing operations [Abstract] |  |  |
Total income tax expense - Federal | 136 | 139 | 120
Total income tax expense - State | 23 | 24 | 20
Total income tax from continuing operations | 159 | 163 | 140
Other comprehensive income | 1 | (1) | (1)
Reconciliation of Income Tax Expense |  |  |
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% | $ 146 | $ 150 | $ 131
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: |  |  |
State income taxes, net of federal income tax benefit | $ 15 | $ 16 | $ 13
Amortization of investment tax credit | (2) | (2) | (2)
Other | 0 | (1) | (2)
Total increase (decrease) | 13 | 13 | 9
Total income tax from continuing operations | $ 159 | $ 163 | $ 140
Effective income tax rate | 38.00% | 38.10% | 37.40%
Taxes, other than income |  |  |
Domestic property and other | $ 32 | $ 30 | $ 29
Total | 32 | $ 30 | $ 29
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 (benefit) from continuing operations [Abstract] |  |  |
Total income tax from continuing operations | 0 |  |
Increase (decrease) due to: |  |  |
Total income tax from continuing operations | $ 0 |  |

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