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Financing Activities (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Schedule of Line of Credit Facilities | The following credit facilities were in place at:
| June 30, 2018 |  | December 31, 2017
| Expiration Date |  | Capacity |  | Borrowed |  | Letters of Credit and Commercial Paper Issued |  | Unused Capacity |  | Borrowed |  | Letters of Credit and Commercial Paper Issued
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.K. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WPD plc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility (a) | Jan. 2023 |  | £ | 210 |  |  | £ | 150 |  |  | £ | — |  |  | £ | 60 |  |  | £ | 148 |  |  | £ | — |
Term Loan Facility (b) | Dec. 2018 |  | 130 |  |  | 130 |  |  | — |  |  | — |  |  | — |  |  | — |
WPD (South West) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | July 2021 |  | 245 |  |  | — |  |  | — |  |  | 245 |  |  | — |  |  | — |
WPD (East Midlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility (c) | July 2021 |  | 300 |  |  | 99 |  |  | — |  |  | 201 |  |  | 180 |  |  | — |
WPD (West Midlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility (d) | July 2021 |  | 300 |  |  | 34 |  |  | — |  |  | 266 |  |  | 120 |  |  | — |
Uncommitted Credit Facilities |  |  | 130 |  |  | — |  |  | 4 |  |  | 126 |  |  | — |  |  | 4 |
Total U.K. Credit Facilities (e) |  |  | £ | 1,315 |  |  | £ | 413 |  |  | £ | 4 |  |  | £ | 898 |  |  | £ | 448 |  |  | £ | 4 |
U.S. |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Capital Funding |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2023 |  | $ | 950 |  |  | $ | — |  |  | $ | 950 |  |  | $ | — |  |  | $ | — |  |  | $ | 230 |
Syndicated Credit Facility | Nov. 2018 |  | 300 |  |  | — |  |  | 49 |  |  | 251 |  |  | — |  |  | — |
Bilateral Credit Facility | Mar. 2019 |  | 100 |  |  | — |  |  | 20 |  |  | 80 |  |  | — |  |  | 18 |
Total PPL Capital Funding Credit Facilities |  |  | $ | 1,350 |  |  | $ | — |  |  | $ | 1,019 |  |  | $ | 331 |  |  | $ | — |  |  | $ | 248 |
PPL Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2023 |  | $ | 650 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 649 |  |  | $ | — |  |  | $ | 1 |
LKE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Oct. 2018 |  | $ | 75 |  |  | $ | — |  |  | $ | — |  |  | $ | 75 |  |  | $ | — |  |  | $ | — |
LG&E |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2023 |  | $ | 500 |  |  | $ | — |  |  | $ | 183 |  |  | $ | 317 |  |  | $ | — |  |  | $ | 199 |
Term Loan Credit Facility | Oct. 2019 |  | 200 |  |  | 200 |  |  | — |  |  | — |  |  | 100 |  |  | — |
Total LG&E Credit Facilities |  |  | $ | 700 |  |  | $ | 200 |  |  | $ | 183 |  |  | $ | 317 |  |  | $ | 100 |  |  | $ | 199 |
KU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2023 |  | $ | 400 |  |  | $ | — |  |  | $ | 133 |  |  | $ | 267 |  |  | $ | — |  |  | $ | 45 |
Letter of Credit Facility | Oct. 2020 |  | 198 |  |  | — |  |  | 198 |  |  | — |  |  | — |  |  | 198 |
Total KU Credit Facilities |  |  | $ | 598 |  |  | $ | — |  |  | $ | 331 |  |  | $ | 267 |  |  | $ | — |  |  | $ | 243 |
(a) | The amounts borrowed at June 30, 2018 and December 31, 2017 were USD-denominated borrowings of $200 million for both periods, which bore interest at 2.81% and 2.17%. The unused capacity reflects the amount borrowed in GBP of £150 million as of the date borrowed.
(b) | The amount borrowed at June 30, 2018 was a GBP-denominated borrowing which equated to $173 million and bore interest at 1.75%.
(c) | The amounts borrowed at June 30, 2018 and December 31, 2017 were GBP-denominated borrowings which equated to $132 million and $244 million and bore interest at 0.90% and 0.89%.
(d) | The amounts borrowed at June 30, 2018 and December 31, 2017 were GBP-denominated borrowings which equated to $45 million and $162 million and bore interest at 0.90% and 0.89%.
(e) | At June 30, 2018, the unused capacity under the U.K. credit facilities was $1.2 billion.
Schedule of Short-term Debt | The following commercial paper programs were in place at:
| June 30, 2018 |  | December 31, 2017
| Weighted - Average Interest Rate |  | Capacity |  | Commercial Paper Issuances |  | Unused Capacity |  | Weighted - Average Interest Rate |  | Commercial Paper Issuances
PPL Capital Funding | 2.42% |  | $ | 1,000 |  |  | $ | 999 |  |  | $ | 1 |  |  | 1.64% |  | $ | 230 |
PPL Electric |  |  | 650 |  |  | — |  |  | 650 |  |  |  |  | — |
LG&E | 2.33% |  | 350 |  |  | 183 |  |  | 167 |  |  | 1.83% |  | 199 |
KU | 2.34% |  | 350 |  |  | 133 |  |  | 217 |  |  | 1.97% |  | 45 |
Total |  |  | $ | 2,350 |  |  | $ | 1,315 |  |  | $ | 1,035 |  |  |  |  | $ | 474 |

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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