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Utility Rate Regulation (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulated Operations [Line Items] |
Regulatory Assets and Liabilities | The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations at December 31:
| PPL |  | PPL Electric
| 2018 |  | 2017 |  | 2018 |  | 2017
Current Regulatory Assets: |  |  |  |  |  |  |
Environmental cost recovery | $ | — |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |
Generation formula rate | — |  |  | 6 |  |  | — |  |  | — |
Gas supply clause | 12 |  |  | 4 |  |  | — |  |  | — |
Smart meter rider | 11 |  |  | 15 |  |  | 11 |  |  | 15 |
Plant outage costs | 10 |  |  | 3 |  |  | — |  |  | — |
Other | 3 |  |  | 1 |  |  | — |  |  | 1 |
Total current regulatory assets (a) | $ | 36 |  |  | $ | 34 |  |  | $ | 11 |  |  | $ | 16 |
Noncurrent Regulatory Assets: |  |  |  |  |  |  |
Defined benefit plans | $ | 963 |  |  | $ | 880 |  |  | $ | 558 |  |  | $ | 504 |
Taxes recoverable through future rates | 3 |  |  | 3 |  |  | 3 |  |  | 3 |
Storm costs | 56 |  |  | 33 |  |  | 22 |  |  | — |
Unamortized loss on debt | 45 |  |  | 54 |  |  | 22 |  |  | 29 |
Interest rate swaps | 20 |  |  | 26 |  |  | — |  |  | — |
Terminated interest rate swaps | 87 |  |  | 92 |  |  | — |  |  | — |
Accumulated cost of removal of utility plant | 200 |  |  | 173 |  |  | 200 |  |  | 173 |
AROs | 273 |  |  | 234 |  |  | — |  |  | — |
Act 129 compliance rider | 19 |  |  | — |  |  | 19 |  |  | — |
Other | 7 |  |  | 9 |  |  | — |  |  | — |
Total noncurrent regulatory assets | $ | 1,673 |  |  | $ | 1,504 |  |  | $ | 824 |  |  | $ | 709 |
Current Regulatory Liabilities: |  |  |  |  |  |  |
Generation supply charge | $ | 33 |  |  | $ | 34 |  |  | $ | 33 |  |  | $ | 34 |
Transmission service charge | 3 |  |  | 9 |  |  | 3 |  |  | 9 |
Environmental cost recovery | 16 |  |  | 1 |  |  | — |  |  | — |
Universal service rider | 27 |  |  | 26 |  |  | 27 |  |  | 26 |
Transmission formula rate | 3 |  |  | 9 |  |  | 3 |  |  | 9 |
TCJA customer refund | 20 |  |  | — |  |  | 3 |  |  | — |
Storm damage expense rider | 5 |  |  | 8 |  |  | 5 |  |  | 8 |
Other | 15 |  |  | 8 |  |  | — |  |  | — |
Total current regulatory liabilities | $ | 122 |  |  | $ | 95 |  |  | $ | 74 |  |  | $ | 86 |
| PPL |  | PPL Electric
| 2018 |  | 2017 |  | 2018 |  | 2017
Noncurrent Regulatory Liabilities: |  |  |  |  |  |  |
Accumulated cost of removal of utility plant | $ | 674 |  |  | $ | 677 |  |  | $ | — |  |  | $ | — |
Power purchase agreement - OVEC | 59 |  |  | 68 |  |  | — |  |  | — |
Net deferred taxes | 1,826 |  |  | 1,853 |  |  | 629 |  |  | 668 |
Defined benefit plans | 37 |  |  | 27 |  |  | 5 |  |  | — |
Terminated interest rate swaps | 72 |  |  | 74 |  |  | — |  |  | — |
TCJA customer refund | 41 |  |  | — |  |  | 41 |  |  | — |
Other | 5 |  |  | 5 |  |  | — |  |  | — |
Total noncurrent regulatory liabilities | $ | 2,714 |  |  | $ | 2,704 |  |  | $ | 675 |  |  | $ | 668 |
| LKE |  | LG&E |  | KU
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Current Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |
Plant outage costs | $ | 10 |  |  | $ | 3 |  |  | $ | 7 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |
Generation formula rate | — |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | 6 |
Gas supply clause | 12 |  |  | 4 |  |  | 12 |  |  | 4 |  |  | — |  |  | — |
Other | 3 |  |  | 5 |  |  | 2 |  |  | 5 |  |  | 1 |  |  | — |
Total current regulatory assets | $ | 25 |  |  | $ | 18 |  |  | $ | 21 |  |  | $ | 12 |  |  | $ | 4 |  |  | $ | 6 |
Noncurrent Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |
Defined benefit plans | $ | 405 |  |  | $ | 376 |  |  | $ | 249 |  |  | $ | 234 |  |  | $ | 156 |  |  | $ | 142 |
Storm costs | 34 |  |  | 33 |  |  | 20 |  |  | 18 |  |  | 14 |  |  | 15 |
Unamortized loss on debt | 23 |  |  | 25 |  |  | 15 |  |  | 16 |  |  | 8 |  |  | 9 |
Interest rate swaps | 20 |  |  | 26 |  |  | 20 |  |  | 26 |  |  | — |  |  | — |
Terminated interest rate swaps | 87 |  |  | 92 |  |  | 51 |  |  | 54 |  |  | 36 |  |  | 38 |
AROs | 273 |  |  | 234 |  |  | 75 |  |  | 61 |  |  | 198 |  |  | 173 |
Other | 7 |  |  | 9 |  |  | 1 |  |  | 2 |  |  | 6 |  |  | 7 |
Total noncurrent regulatory assets | $ | 849 |  |  | $ | 795 |  |  | $ | 431 |  |  | $ | 411 |  |  | $ | 418 |  |  | $ | 384 |
Current Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |
Environmental cost recovery | $ | 16 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 10 |  |  | $ | 1 |
Fuel adjustment clauses | — |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |
Gas line tracker | 2 |  |  | 3 |  |  | 2 |  |  | 3 |  |  | — |  |  | — |
TCJA customer refund | 17 |  |  | — |  |  | 7 |  |  | — |  |  | 10 |  |  | — |
Generation formula Rate | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |
Other | 6 |  |  | 2 |  |  | 2 |  |  | — |  |  | 4 |  |  | 2 |
Total current regulatory liabilities | $ | 48 |  |  | $ | 9 |  |  | $ | 17 |  |  | $ | 3 |  |  | $ | 31 |  |  | $ | 6 |
Noncurrent Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accumulated cost of removal of utility plant | $ | 674 |  |  | $ | 677 |  |  | $ | 279 |  |  | $ | 282 |  |  | $ | 395 |  |  | $ | 395 |
Power purchase agreement - OVEC | 59 |  |  | 68 |  |  | 41 |  |  | 47 |  |  | 18 |  |  | 21 |
Net deferred taxes | 1,197 |  |  | 1,185 |  |  | 557 |  |  | 552 |  |  | 640 |  |  | 633 |
Defined benefit plans | 32 |  |  | 27 |  |  | — |  |  | — |  |  | 32 |  |  | 27 |
Terminated interest rate swaps | 72 |  |  | 74 |  |  | 36 |  |  | 37 |  |  | 36 |  |  | 37 |
Other | 5 |  |  | 5 |  |  | 2 |  |  | 1 |  |  | 3 |  |  | 4 |
Total noncurrent regulatory liabilities | $ | 2,039 |  |  | $ | 2,036 |  |  | $ | 915 |  |  | $ | 919 |  |  | $ | 1,124 |  |  | $ | 1,117 |
(a) | For PPL, these amounts are included in "Other current assets" on the Balance Sheets.

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- Definition Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References No definition available. + Details
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