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Adoption of Accounting Guidance (Tables) | 6 Months Ended
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Jun. 30, 2018
Adoption of Accounting Guidance [Abstract] |
Schedule of Non-Service Benefits Costs (Credits) [Table Text Block] | The following provides the non-service cost components of net periodic benefits (costs) or credits presented in "Other Income (Expense) - net" in 2018 and reclassified from "Other operation and maintenance" to "Other Income (Expense) - net" in 2017 on the Statements of Income as a result of the adoption.
| Three Months |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
PPL | $ | 66 |  |  | $ | 44 |  |  | $ | 134 |  |  | $ | 82 |
PPL Electric | 1 |  |  | 1 |  |  | 3 |  |  | — |
LKE | — |  |  | — |  |  | 2 |  |  | (2 | )
LG&E | (2 | ) |  | — |  |  | (1 | ) |  | (2 | )
KU | 1 |  |  | — |  |  | 2 |  |  | (1 | )
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement | The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:
| PPL |  | PPL Electric
| June 30, 2018 |  | December 31, 2017 |  | June 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 852 |  |  | $ | 485 |  |  | $ | 489 |  |  | $ | 49 |
Restricted cash - current (a) | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Restricted cash - noncurrent (a) | 20 |  |  | 23 |  |  | — |  |  | — |
Total Cash, Cash Equivalents and Restricted Cash | $ | 875 |  |  | $ | 511 |  |  | $ | 491 |  |  | $ | 51 |
(a) | Bank deposits and other cash equivalents that are restricted by agreement or that have been clearly designated for a specific purpose are classified as restricted cash. On the Balance Sheets, the current portion of restricted cash is included in "Other current assets," while the noncurrent portion is included in "Other noncurrent assets."

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- Definition [Table Text Block] for Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow [Table] + References No definition available. + Details
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- Definition Schedule of Non-Service Benefits Costs (Credits) [Table Text Block] + References No definition available. + Details
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