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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2017
Income Taxes [Line Items] |
Schedule of Effective Income Tax Rate Reconciliation | Reconciliations of income taxes for the periods ended September 30 are as follows.
(PPL)
| Three Months |  | Nine Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ | 165 |  |  | $ | 214 |  |  | $ | 480 |  |  | $ | 681 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal income tax benefit | 14 |  |  | 13 |  |  | 37 |  |  | 37 |
Valuation allowance adjustments | 4 |  |  | 4 |  |  | 9 |  |  | 13 |
Impact of lower U.K. income tax rates | (45 | ) |  | (37 | ) |  | (133 | ) |  | (136 | )
U.S. income tax on foreign earnings - net of foreign tax credit (a) | (8 | ) |  | (1 | ) |  | (24 | ) |  | (3 | )
Impact of the U.K. Finance Acts (b) | (3 | ) |  | (42 | ) |  | (12 | ) |  | (42 | )
Depreciation not normalized | (2 | ) |  | — |  |  | (7 | ) |  | (6 | )
Interest benefit on U.K. financing entities | (4 | ) |  | (4 | ) |  | (12 | ) |  | (13 | )
Stock-based compensation | — |  |  | (1 | ) |  | (7 | ) |  | (12 | )
Other | (5 | ) |  | (7 | ) |  | (10 | ) |  | (9 | )
Total increase (decrease) | (49 | ) |  | (75 | ) |  | (159 | ) |  | (171 | )
Total income taxes | $ | 116 |  |  | $ | 139 |  |  | $ | 321 |  |  | $ | 510 |
(a) | Lower income taxes primarily due to the tax benefit of accelerated pension contributions made in the first quarter of 2017. The related tax benefit is recognized over the annual period as a result of utilizing an estimated annual effective tax rate.
(b) | The U.K. Finance Act 2016, enacted in September 2016, reduces the U.K. statutory income tax rate effective April 1, 2020 from 18% to 17%. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit during the three and nine months ended September 30, 2016.
PPL Electric Utilities Corp [Member] |
Income Taxes [Line Items] |
Schedule of Effective Income Tax Rate Reconciliation | Reconciliations of income taxes for the periods ended September 30 are as follows.
(PPL Electric) |  |  |  |  |  |  |
| Three Months |  | Nine Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ | 56 |  |  | $ | 52 |  |  | $ | 144 |  |  | $ | 149 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal income tax benefit | 9 |  |  | 9 |  |  | 26 |  |  | 27 |
Depreciation not normalized | (1 | ) |  | (2 | ) |  | (5 | ) |  | (5 | )
Stock-based compensation | — |  |  | — |  |  | (5 | ) |  | (7 | )
Other | — |  |  | (1 | ) |  | (1 | ) |  | (2 | )
Total increase (decrease) | 8 |  |  | 6 |  |  | 15 |  |  | 13 |
Total income taxes | $ | 64 |  |  | $ | 58 |  |  | $ | 159 |  |  | $ | 162 |
LG And E And KU Energy LLC [Member] |
Income Taxes [Line Items] |
Schedule of Effective Income Tax Rate Reconciliation | Reconciliations of income taxes for the periods ended September 30 are as follows.
(LKE) |  |  |  |  |  |  |
| Three Months |  | Nine Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ | 74 |  |  | $ | 74 |  |  | $ | 181 |  |  | $ | 189 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal income tax benefit | 8 |  |  | 8 |  |  | 19 |  |  | 20 |
Amortization of investment tax credit | (1 | ) |  | (1 | ) |  | (2 | ) |  | (2 | )
Stock-based compensation | — |  |  | (1 | ) |  | (1 | ) |  | (2 | )
Other | (2 | ) |  | (1 | ) |  | (2 | ) |  | (3 | )
Total increase (decrease) | 5 |  |  | 5 |  |  | 14 |  |  | 13 |
Total income taxes | $ | 79 |  |  | $ | 79 |  |  | $ | 195 |  |  | $ | 202 |
Louisville Gas And Electric Co [Member] |
Income Taxes [Line Items] |
Schedule of Effective Income Tax Rate Reconciliation | Reconciliations of income taxes for the periods ended September 30 are as follows.
(LG&E) |  |  |  |  |  |  |
| Three Months |  | Nine Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ | 36 |  |  | $ | 36 |  |  | $ | 91 |  |  | $ | 90 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal income tax benefit | 4 |  |  | 4 |  |  | 10 |  |  | 10 |
Other | (1 | ) |  | (1 | ) |  | (2 | ) |  | (2 | )
Total increase (decrease) | 3 |  |  | 3 |  |  | 8 |  |  | 8 |
Total income taxes | $ | 39 |  |  | $ | 39 |  |  | $ | 99 |  |  | $ | 98 |
Kentucky Utilities Co [Member] |
Income Taxes [Line Items] |
Schedule of Effective Income Tax Rate Reconciliation | Reconciliations of income taxes for the periods ended September 30 are as follows.
(KU) |  |  |  |  |  |  |
| Three Months |  | Nine Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ | 43 |  |  | $ | 44 |  |  | $ | 111 |  |  | $ | 117 |
Increase (decrease) due to: |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal income tax benefit | 5 |  |  | 5 |  |  | 11 |  |  | 12 |
Other | (1 | ) |  | (1 | ) |  | (2 | ) |  | (1 | )
Total increase (decrease) | 4 |  |  | 4 |  |  | 9 |  |  | 11 |
Total income taxes | $ | 47 |  |  | $ | 48 |  |  | $ | 120 |  |  | $ | 128 |

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