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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 129 | $ 236 | $ 315 | $ 467
Federal statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | $ 10 | $ 9 | $ 23 | $ 22
Valuation allowance adjustments | 0 | 3 | 5 | 9
Impact of lower U.K. income tax rates | (40) | (45) | (88) | (99)
U.S. income tax on foreign earnings - net of foreign tax credit | (7) | 0 | (16) | (2)
Impact of the U.K. Finance Acts | (6) | (2) | (9) | (2)
Depreciation not normalized | (2) | (3) | (5) | (4)
Interest benefit on U.K. financing entities | (4) | (4) | (8) | (9)
Stock-based compensation | (4) | (3) | (7) | (11)
Other | 0 | 1 | (5) | 0
Total increase (decrease) | (53) | (44) | (110) | (96)
Total income taxes | 76 | 192 | 205 | 371
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 44 | $ 44 | $ 88 | $ 97
Federal statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | $ 9 | $ 8 | $ 17 | $ 18
Depreciation not normalized | (2) | (2) | (4) | (3)
Stock-based compensation | (3) | (2) | (5) | (7)
Other | (1) | 0 | (1) | (1)
Total increase (decrease) | 3 | 4 | 7 | 7
Total income taxes | 47 | 48 | 95 | 104
LG And E And KU Energy LLC [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 49 | $ 47 | $ 107 | $ 114
Federal statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | $ 5 | $ 5 | $ 11 | $ 12
Other | (1) | (1) | (2) | (3)
Total increase (decrease) | 4 | 4 | 9 | 9
Total income taxes | 53 | 51 | 116 | 123
Louisville Gas And Electric Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 24 | $ 22 | $ 55 | $ 54
Federal statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | $ 3 | $ 2 | $ 6 | $ 6
Other | 0 | 0 | (1) | (1)
Total increase (decrease) | 3 | 2 | 5 | 5
Total income taxes | 27 | 24 | 60 | 59
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 32 | $ 31 | $ 67 | $ 73
Federal statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | $ 3 | $ 3 | $ 7 | $ 7
Other | (1) | 0 | (1) | 0
Total increase (decrease) | 2 | 3 | 6 | 7
Total income taxes | $ 34 | $ 34 | $ 73 | $ 80

X
- 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 Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the U.K. statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase(decrease) in the income tax rates. + 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 current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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