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Summary of Significant Accounting Policies (Policies) | 6 Months Ended
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Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncements, Policy | New Accounting Guidance Adopted (All Registrants) Accounting for Revenue from Contracts with Customers Effective January 1, 2018, the Registrants adopted accounting guidance that establishes a comprehensive new model for the recognition of revenue from contracts with customers. This model is based on the core principle that revenue should be recognized to depict the transfer of control of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Registrants adopted this guidance using the modified retrospective transition method. No cumulative effect adjustment was required as of the January 1, 2018 adoption date. The adoption of this guidance did not have a material impact on the Registrants' revenue recognition policies. See Note 4 for the required disclosures as a result of the adoption of this standard. Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost Effective January 1, 2018, the Registrants adopted accounting guidance that changes the income statement presentation of net periodic benefit cost. Retrospectively, this guidance requires the service cost component to be disaggregated from other components of net benefit cost and presented in the same income statement line items as other employee compensation costs arising from services rendered during the period. The other components of net periodic benefits are presented separately from the line items that include the service cost and outside of any subtotal of operating income. Prospectively, the guidance limits the capitalization to the service cost component of net periodic benefit costs. For PPL, the non-service cost components of net periodic benefit costs were in a net credit position for the three and six months ended June 30, 2018. The non-service cost credits that would have been capitalized under previous guidance, but are now recorded as income within "Other Income (Expense) - net," were $6 million ($5 million after-tax or $0.01 per share) and $11 million ($9 million after-tax or $0.01 per share) for the three and six months ended June 30, 2018. For PPL Electric, LG&E and KU, non-service costs or credits that would have been capitalized under previous guidance are now recognized as a regulatory asset or regulatory liability, as applicable, in accordance with regulatory approvals. 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 | )
PPL and PPL Electric elected to use the practical expedient that permits using the amounts disclosed in the defined benefit plan note for the prior comparative period as the estimation basis for applying the retrospective presentation requirements. Presentation of Restricted Cash in the Statement of Cash Flows (PPL and PPL Electric) Effective January 1, 2018, PPL and PPL Electric adopted accounting guidance that changes the cash flow statement presentation of restricted cash. Under the new guidance, amounts considered restricted cash are presented with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total cash amounts on the Statements of Cash Flows. The guidance requires a reconciliation of the total cash, cash equivalents and restricted cash from the Statement of Cash Flows to amounts on the Balance Sheets and disclosure of the nature of the restrictions. PPL and PPL Electric have applied this guidance on a retrospective basis for all periods presented. The adoption of this guidance did not have a material impact on the Statements of Cash Flows. Reconciliation of Cash, Cash Equivalents and Restricted Cash 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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