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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Other Intangible Assets [Line Items] |
Goodwill Rollforward | The changes in the carrying amount of goodwill by segment were:
| U.K. Regulated |  | Kentucky Regulated |  | Corporate and Other |  | Total
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Balance at beginning of period (a) | $ | 2,596 |  |  | $ | 2,398 |  |  | $ | 662 |  |  | $ | 662 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,258 |  |  | $ | 3,060 |
Effect of foreign currency exchange rates | (149 | ) |  | 198 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (149 | ) |  | 198 |
Goodwill recognized during the period (b) | — |  |  | — |  |  | — |  |  | — |  |  | 53 |  |  | — |  |  | 53 |  |  | — |
Balance at end of period (a) | $ | 2,447 |  |  | $ | 2,596 |  |  | $ | 662 |  |  | $ | 662 |  |  | $ | 53 |  |  | $ | — |  |  | $ | 3,162 |  |  | $ | 3,258 |
(a) | There were no accumulated impairment losses related to goodwill.
(b) | Recognized as a result of the acquisition of Safari Energy.
Other Intangible Assets | The gross carrying amount and the accumulated amortization of other intangible assets were:
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Subject to amortization: |  |  |  |  |  |  |
Contracts (a) | $ | 137 |  |  | $ | 75 |  |  | $ | 138 |  |  | $ | 67 |
Land rights and easements | 418 |  |  | 128 |  |  | 382 |  |  | 120 |
Licenses and other | 21 |  |  | 1 |  |  | 8 |  |  | 3 |
Total subject to amortization | 576 |  |  | 204 |  |  | 528 |  |  | 190 |
Not subject to amortization due to indefinite life: |  |  |  |  |  |  |
Land rights and easements | 339 |  |  | — |  |  | 359 |  |  | — |
Other | 6 |  |  | — |  |  | — |  |  | — |
Total not subject to amortization due to indefinite life | 345 |  |  | — |  |  | 359 |  |  | — |
Total | $ | 921 |  |  | $ | 204 |  |  | $ | 887 |  |  | $ | 190 |
(a) | Gross carrying amount in 2018 and 2017 includes the fair value at the acquisition date of the OVEC power purchase contract with terms favorable to market recognized as a result of the 2010 acquisition of LKE by PPL.
Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits |
Amortization Expense was as follows: |  |  |  |  |
| 2018 |  | 2017 |  | 2016
Intangible assets with no regulatory offset | $ | 7 |  |  | $ | 6 |  |  | $ | 6 |
Intangible assets with regulatory offset | 8 |  |  | 9 |  |  | 24 |
Total | $ | 15 |  |  | $ | 15 |  |  | $ | 30 |
Future Amortization Expense | Amortization expense for each of the next five years is estimated to be:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Intangible assets with no regulatory offset | $ | 7 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 7 |
Intangible assets with regulatory offset | 9 |  |  | 8 |  |  | 8 |  |  | 8 |  |  | 8 |
Total | $ | 16 |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | 15 |
PPL Electric Utilities Corp [Member] |
Goodwill and Other Intangible Assets [Line Items] |
Other Intangible Assets | The gross carrying amount and the accumulated amortization of other intangible assets were:
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Subject to amortization: |  |  |  |  |  |  |
Land rights and easements | $ | 363 |  |  | $ | 121 |  |  | $ | 361 |  |  | $ | 117 |
Licenses and other | 2 |  |  | 1 |  |  | 3 |  |  | 1 |
Total subject to amortization | 365 |  |  | 122 |  |  | 364 |  |  | 118 |
Not subject to amortization due to indefinite life: |  |  |  |  |  |  |
Land rights and easements | 17 |  |  | — |  |  | 13 |  |  | — |
Total | $ | 382 |  |  | $ | 122 |  |  | $ | 377 |  |  | $ | 118 |
LG And E And KU Energy LLC [Member] |
Goodwill and Other Intangible Assets [Line Items] |
Other Intangible Assets | The gross carrying amount and the accumulated amortization of other intangible assets were:
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Subject to amortization: |  |  |  |  |  |  |
Land rights and easements | $ | 21 |  |  | $ | 3 |  |  | $ | 21 |  |  | $ | 3 |
OVEC power purchase agreement (a) | 126 |  |  | 66 |  |  | 126 |  |  | 58 |
Total subject to amortization | $ | 147 |  |  | $ | 69 |  |  | $ | 147 |  |  | $ | 61 |
(a) | Gross carrying amount represents the fair value at the acquisition date of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to this contract, which is being amortized over the same period as the intangible asset, eliminating any income statement impact. See Note 7 for additional information.
Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits | Amortization expense was as follows:
| 2018 |  | 2017 |  | 2016
Intangible assets with no regulatory offset | $ | — |  |  | $ | — |  |  | $ | 1 |
Intangible assets with regulatory offset | 8 |  |  | 9 |  |  | 24 |
Total | $ | 8 |  |  | $ | 9 |  |  | $ | 25 |
Future Amortization Expense | Amortization expense for each of the next five years is estimated to be:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Intangible assets with regulatory offset | $ | 9 |  |  | $ | 8 |  |  | $ | 8 |  |  | $ | 8 |  |  | $ | 8 |
Louisville Gas And Electric Co [Member] |
Goodwill and Other Intangible Assets [Line Items] |
Other Intangible Assets | The gross carrying amount and the accumulated amortization of other intangible assets were:
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Subject to amortization: |  |  |  |  |  |  |
Land rights and easements | $ | 7 |  |  | $ | 1 |  |  | $ | 7 |  |  | $ | 1 |
OVEC power purchase agreement (a) | 87 |  |  | 46 |  |  | 87 |  |  | 40 |
Total subject to amortization | $ | 94 |  |  | $ | 47 |  |  | $ | 94 |  |  | $ | 41 |
(a) | Gross carrying amount represents the fair value at the acquisition date of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to this contract, which is being amortized over the same period as the intangible asset, eliminating any income statement impact. See Note 7 for additional information.
Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits | Amortization expense was as follows:
| 2018 |  | 2017 |  | 2016
Intangible assets with regulatory offset | $ | 6 |  |  | $ | 6 |  |  | $ | 13 |
Future Amortization Expense | Amortization expense for each of the next five years is estimated to be:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Intangible assets with regulatory offset | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |
Kentucky Utilities Co [Member] |
Goodwill and Other Intangible Assets [Line Items] |
Other Intangible Assets | The gross carrying amount and the accumulated amortization of other intangible assets were:
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Subject to amortization: |  |  |  |  |  |  |
Land rights and easements | $ | 14 |  |  | $ | 2 |  |  | $ | 14 |  |  | $ | 2 |
OVEC power purchase agreement (a) | 39 |  |  | 20 |  |  | 39 |  |  | 18 |
Total subject to amortization | $ | 53 |  |  | $ | 22 |  |  | $ | 53 |  |  | $ | 20 |
(a) | Gross carrying amount represents the fair value at the acquisition date of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to this contract, which is being amortized over the same period as the intangible asset, eliminating any income statement impact. See Note 7 for additional information.
Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits | Amortization expense was as follows:
| 2018 |  | 2017 |  | 2016
Intangible assets with no regulatory offset | $ | — |  |  | $ | — |  |  | $ | 1 |
Intangible assets with regulatory offset | 2 |  |  | 3 |  |  | 11 |
Total | $ | 2 |  |  | $ | 3 |  |  | $ | 12 |
Future Amortization Expense | Amortization expense for each of the next five years is estimated to be:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Intangible assets with regulatory offset | $ | 3 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |

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