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Summary of Significant Accounting Policies (Policies) | 3 Months Ended
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Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Credit Loss, Financial Instrument [Text Block] | Current Expected Credit Losses (All Registrants) Financing receivable collectibility is evaluated using a combination of factors, including past due status based on contractual terms, trends in write-offs and the age of the receivable. Specific events, such as bankruptcies, are also considered when applicable. Adjustments to the reserve for credit losses are made when necessary based on the results of analysis, the aging of receivables and historical and industry trends. The Registrants periodically evaluate the impact of observable external factors on the collectibility of the financing receivables to determine if adjustments to the reserve for credit losses should be made based on current conditions or reasonable and supportable forecasts. Accounts receivable are written off in the period in which the receivable is deemed uncollectible. (PPL and PPL Electric) PPL Electric has identified one class of financing receivables, “accounts receivable-customer”, which includes financing receivables for all billed and unbilled sales with residential and non-residential customers. All other financing receivables are classified as other. Within the credit loss model for the residential customer accounts receivables, customers are disaggregated based on their projected propensity to pay, which is derived from historical trends and the current activity of the individual customer accounts. Conversely, the non-residential customer accounts receivables are not further segmented due to the varying nature of the individual customers, which lack readily identifiable risk characteristics for disaggregation. (PPL, LKE, LG&E and KU) LKE, LG&E and KU have identified one class of financing receivables, “accounts receivable-customer”, which includes financing receivables for all billed and unbilled sales with customers. All other financing receivables are classified as other. (All Registrants) The following table shows changes in the allowance for credit losses for the period ended March 31, 2020:
| Balance at Beginning of Period (a) |  | Charged to Income |  | Deductions (b) |  | Balance at End of Period
PPL |  |  |  |  |  |  |
Accounts Receivable - Customer and Unbilled Revenue | $ | 30 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 34 |
Other (c) | 27 |  |  | — |  |  | 1 |  |  | 26 |
PPL Electric |  |  |  |  |  |  |
Accounts Receivable - Customer and Unbilled Revenue | $ | 25 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 28 |
Other | 1 |  |  | — |  |  | — |  |  | 1 |
| Balance at Beginning of Period (a) |  | Charged to Income |  | Deductions (b) |  | Balance at End of Period
LKE |  |  |  |  |  |  |
Accounts Receivable - Customer and Unbilled Revenue | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |
Other (c) | 26 |  |  | — |  |  | 1 |  |  | 25 |
LG&E |  |  |  |  |  |  |
Accounts Receivable - Customer and Unbilled Revenue | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
KU |  |  |  |  |  |  |
Accounts Receivable - Customer and Unbilled Revenue | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
(a) | Reflects cumulative-effect adjustment upon adoption of current expected credit loss guidance.
(b) | Primarily related to uncollectible accounts receivable written off.
(c) | Primarily related to receivables at WKE, which are fully reserved.
New Accounting Pronouncements, Policy | New Accounting Guidance Adopted (All Registrants) Accounting for Financial Instrument Credit Losses Effective January 1, 2020, the Registrants adopted accounting guidance, using a modified retrospective approach, that requires the use of a current expected credit loss (CECL) model for the measurement of credit losses on financial instruments within the scope of the guidance, which includes accounts receivable. The CECL model requires an entity to measure credit losses using historical information, current information and reasonable and supportable forecasts of future events, rather than the incurred loss impairment model required under previous GAAP. The adoption of this guidance did not have a material impact on the Registrants. Accounting for Implementation Costs in a Cloud Computing Service Arrangement Effective January 1, 2020, the Registrants prospectively adopted accounting guidance that requires a customer in a cloud computing hosting arrangement that is a service contract to capitalize implementation costs consistent with internal-use software guidance for non-service arrangements. The guidance requires these capitalized implementation costs to be amortized over the term of the hosting arrangement to the statement of income line item where the service arrangement costs are recorded. The guidance also prescribes the financial statement classification of the capitalized implementation costs and cash flows associated with the arrangement. The adoption of this guidance did not have a material impact on the Registrants. (PPL, LKE, LG&E and KU) Simplifying the Test for Goodwill Impairment Effective January 1, 2020, the Registrants adopted accounting guidance that simplifies the test for goodwill impairment by eliminating the second step of the quantitative test. The second step of the quantitative test required a calculation of the implied fair value of goodwill, which was determined in the same manner as the amount of goodwill in a business combination. Under the new guidance, the fair value of a reporting unit will be compared with the carrying value and an impairment charge will be recognized if the carrying amount exceeds the fair value of the reporting unit. The adoption of this guidance did not have a material impact on the Registrants.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] | Restricted Cash and Cash Equivalents (PPL and PPL Electric) 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
| March 31, 2020 |  | December 31, 2019 |  | March 31, 2020 |  | December 31, 2019
Cash and cash equivalents | $ | 915 |  |  | $ | 815 |  |  | $ | 33 |  |  | $ | 262 |
Restricted cash - current (a) | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Restricted cash - noncurrent (a) | 18 |  |  | 18 |  |  | — |  |  | — |
Total Cash, Cash Equivalents and Restricted Cash | $ | 936 |  |  | $ | 836 |  |  | $ | 35 |  |  | $ | 264 |
(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 Entity's cash and cash equivalents accounting policy with respect to restricted balances. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4273-108586 + Details
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- Definition Disclosure of accounting policy for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security. Includes, but is not limited to, methodology used to estimate allowance for credit loss, how writeoff of uncollectible amount is recognized, and determination of past due status and nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919260-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919272-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447 + Details
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