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Utility Rate Regulation (Tables) | 12 Months Ended
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Dec. 31, 2017
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
| 2017 |  | 2016 |  | 2017 |  | 2016
Current Regulatory Assets: |  |  |  |  |  |  |
Environmental cost recovery | $ | 5 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
Generation formula rate | 6 |  |  | 11 |  |  | — |  |  | — |
Transmission service charge | — |  |  | 7 |  |  | — |  |  | 7 |
Gas supply clause | 4 |  |  | 3 |  |  | — |  |  | — |
Smart meter rider | 15 |  |  | 6 |  |  | 15 |  |  | 6 |
Storm costs | — |  |  | 5 |  |  | — |  |  | 5 |
Other | 4 |  |  | 1 |  |  | 1 |  |  | 1 |
Total current regulatory assets (a) | $ | 34 |  |  | $ | 39 |  |  | $ | 16 |  |  | $ | 19 |
Noncurrent Regulatory Assets: |  |  |  |  |  |  |
Defined benefit plans | $ | 880 |  |  | $ | 947 |  |  | $ | 504 |  |  | $ | 549 |
Taxes recoverable through future rates | 3 |  |  | 340 |  |  | 3 |  |  | 340 |
Storm costs | 33 |  |  | 57 |  |  | — |  |  | 9 |
Unamortized loss on debt | 54 |  |  | 61 |  |  | 29 |  |  | 36 |
Interest rate swaps | 26 |  |  | 31 |  |  | — |  |  | — |
Terminated interest rate swaps | 92 |  |  | 98 |  |  | — |  |  | — |
Accumulated cost of removal of utility plant | 173 |  |  | 159 |  |  | 173 |  |  | 159 |
AROs | 234 |  |  | 211 |  |  | — |  |  | — |
Other | 9 |  |  | 14 |  |  | — |  |  | 1 |
Total noncurrent regulatory assets | $ | 1,504 |  |  | $ | 1,918 |  |  | $ | 709 |  |  | $ | 1,094 |
Current Regulatory Liabilities: |  |  |  |  |  |  |
Generation supply charge | $ | 34 |  |  | $ | 23 |  |  | $ | 34 |  |  | $ | 23 |
Transmission service charge | 9 |  |  | — |  |  | 9 |  |  | — |
Universal service rider | 26 |  |  | 14 |  |  | 26 |  |  | 14 |
Transmission formula rate | 9 |  |  | 15 |  |  | 9 |  |  | 15 |
Fuel adjustment clauses | 3 |  |  | 11 |  |  | — |  |  | — |
Act 129 compliance rider | — |  |  | 17 |  |  | — |  |  | 17 |
Storm damage expense rider | 8 |  |  | 13 |  |  | 8 |  |  | 13 |
Other | 6 |  |  | 8 |  |  | — |  |  | 1 |
Total current regulatory liabilities | $ | 95 |  |  | $ | 101 |  |  | $ | 86 |  |  | $ | 83 |
Noncurrent Regulatory Liabilities: |  |  |  |  |  |  |
Accumulated cost of removal of utility plant | $ | 677 |  |  | $ | 700 |  |  | $ | — |  |  | $ | — |
Power purchase agreement - OVEC (b) | 68 |  |  | 75 |  |  | — |  |  | — |
Net deferred taxes (c) | 1,853 |  |  | 23 |  |  | 668 |  |  | — |
Defined benefit plans | 27 |  |  | 23 |  |  | — |  |  | — |
Terminated interest rate swaps | 74 |  |  | 78 |  |  | — |  |  | — |
Other | 5 |  |  | — |  |  | — |  |  | — |
Total noncurrent regulatory liabilities | $ | 2,704 |  |  | $ | 899 |  |  | $ | 668 |  |  | $ | — |
| LKE |  | LG&E |  | KU
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Current Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |
Environmental cost recovery | $ | 5 |  |  | $ | 6 |  |  | $ | 5 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
Generation formula rate | 6 |  |  | 11 |  |  | — |  |  | — |  |  | 6 |  |  | 11 |
Gas supply clause | 4 |  |  | 3 |  |  | 4 |  |  | 3 |  |  | — |  |  | — |
Other | 3 |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | — |
Total current regulatory assets | $ | 18 |  |  | $ | 20 |  |  | $ | 12 |  |  | $ | 9 |  |  | $ | 6 |  |  | $ | 11 |
| LKE |  | LG&E |  | KU
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Noncurrent Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |
Defined benefit plans | $ | 376 |  |  | $ | 398 |  |  | $ | 234 |  |  | $ | 246 |  |  | $ | 142 |  |  | $ | 152 |
Storm costs | 33 |  |  | 48 |  |  | 18 |  |  | 26 |  |  | 15 |  |  | 22 |
Unamortized loss on debt | 25 |  |  | 25 |  |  | 16 |  |  | 16 |  |  | 9 |  |  | 9 |
Interest rate swaps | 26 |  |  | 31 |  |  | 26 |  |  | 31 |  |  | — |  |  | — |
Terminated interest rate swaps | 92 |  |  | 98 |  |  | 54 |  |  | 57 |  |  | 38 |  |  | 41 |
AROs | 234 |  |  | 211 |  |  | 61 |  |  | 70 |  |  | 173 |  |  | 141 |
Other | 9 |  |  | 13 |  |  | 2 |  |  | 4 |  |  | 7 |  |  | 9 |
Total noncurrent regulatory assets | $ | 795 |  |  | $ | 824 |  |  | $ | 411 |  |  | $ | 450 |  |  | $ | 384 |  |  | $ | 374 |
Current Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |
Demand side management | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 1 |
Fuel adjustment clause | 3 |  |  | 11 |  |  | — |  |  | 2 |  |  | 3 |  |  | 9 |
Gas line tracker | 3 |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | — |
Other | 3 |  |  | 4 |  |  | — |  |  | 1 |  |  | 3 |  |  | 3 |
Total current regulatory liabilities | $ | 9 |  |  | $ | 18 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 6 |  |  | $ | 13 |
Noncurrent Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accumulated cost of removal |  |  |  |  |  |  |  |  |  |  |
of utility plant | $ | 677 |  |  | $ | 700 |  |  | $ | 282 |  |  | $ | 305 |  |  | $ | 395 |  |  | $ | 395 |
Power purchase agreement - OVEC (b) | 68 |  |  | 75 |  |  | 47 |  |  | 52 |  |  | 21 |  |  | 23 |
Net deferred taxes (c) | 1,185 |  |  | 23 |  |  | 552 |  |  | 23 |  |  | 633 |  |  | — |
Defined benefit plans | 27 |  |  | 23 |  |  | — |  |  | — |  |  | 27 |  |  | 23 |
Terminated interest rate swaps | 74 |  |  | 78 |  |  | 37 |  |  | 39 |  |  | 37 |  |  | 39 |
Other | 5 |  |  | — |  |  | 1 |  |  | — |  |  | 4 |  |  | — |
Total noncurrent regulatory liabilities | $ | 2,036 |  |  | $ | 899 |  |  | $ | 919 |  |  | $ | 419 |  |  | $ | 1,117 |  |  | $ | 480 |
(a) | For PPL, these amounts are included in "Other current assets" on the Balance Sheets.
(b) | This liability was recorded as an offset to an intangible asset that was recorded at fair value upon the acquisition of LKE by PPL.
(c) | Primarily relates to excess deferred taxes recorded as a result of the TCJA, which lowered the federal corporate income tax rate effective January 1, 2018 requiring deferred tax balances and the associated regulatory liabilities to be remeasured as of December 31, 2017.

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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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