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Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2018 GBP (£) | Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£)
UNITED KINGDOM |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | £ |  | £ 1,315 |  |  |
Borrowed | £ |  | 497 |  |  | £ 448
Letters of Credit and Commercial Paper Issued | £ |  | 4 |  |  | 4
Unused Capacity | $ 1,100 | 816 |  |  |
UNITED KINGDOM | Uncommitted Credit Facilities [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | £ |  | 130 |  |  |
Borrowed | £ |  | 0 |  |  | 0
Letters of Credit and Commercial Paper Issued | £ |  | 4 |  |  | 4
Unused Capacity | £ |  | 126 |  |  |
WPD PLC [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2022 |  |  |  |
Capacity | £ |  | 210 |  |  |
Borrowed | $ 200 | 145 |  | $ 200 | 148
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  |  | £ 0
Unused Capacity | £ |  | £ 67 |  |  |
Interest rate on outstanding borrowing | 2.47% | 2.47% |  | 2.17% | 2.17%
Borrowings | £ |  | £ 143 |  |  |
WPD PLC [Member] | UNITED KINGDOM | Index Linked Term Loan [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Dec. 31, 2018 |  |  |  |
Capacity | £ |  | 130 |  |  |
Borrowed | $ 179 | 130 |  |  |
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  |  |
Unused Capacity | £ |  | £ 0 |  |  |
Interest rate on outstanding borrowing | 1.77% | 1.77% |  |  |
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jul. 31, 2021 |  |  |  |
Capacity | £ |  | £ 245 |  |  |
Borrowed | £ |  | 0 |  |  | £ 0
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  |  | 0
Unused Capacity | £ |  | 245 |  |  |
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jul. 31, 2021 |  |  |  |
Capacity | £ |  | 300 |  |  |
Borrowed | $ 216 | 157 |  | $ 244 | 180
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  |  | £ 0
Unused Capacity | £ |  | £ 143 |  |  |
Interest rate on outstanding borrowing | 0.90% | 0.90% |  | 0.89% | 0.89%
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jul. 31, 2021 |  |  |  |
Capacity | £ |  | £ 300 |  |  |
Borrowed | $ 89 | 65 |  | $ 162 | £ 120
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  |  | £ 0
Unused Capacity | £ |  | £ 235 |  |  |
Interest rate on outstanding borrowing | 0.90% | 0.90% |  | 0.89% | 0.89%
PPL Capital Funding [Member] | UNITED STATES |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | $ 1,350 |  |  |  |
Borrowed | 0 |  |  | $ 0 |
Letters of Credit and Commercial Paper Issued | 369 |  |  | 248 |
Unused Capacity | $ 981 |  |  |  |
PPL Capital Funding [Member] | UNITED STATES | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 950 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 345 |  |  | 230 |
Unused Capacity | $ 605 |  |  |  |
PPL Capital Funding [Member] | UNITED STATES | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Nov. 30, 2018 |  |  |  |
Capacity | $ 300 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 0 |  |  | 0 |
Unused Capacity | $ 300 |  |  |  |
PPL Capital Funding [Member] | UNITED STATES | Bilateral Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Mar. 31, 2019 |  |  |  |
Capacity | $ 100 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 24 |  |  | 18 |
Unused Capacity | $ 76 |  |  |  |
PPL Electric [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 650 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 214 |  |  | 1 |
Unused Capacity | $ 436 |  |  |  |
LKE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2018 |  |  |  |
Capacity | $ 75 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 0 |  |  | 0 |
Unused Capacity | 75 |  |  |  |
LGE [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | 700 |  |  |  |
Borrowed | 200 |  |  | 100 |
Letters of Credit and Commercial Paper Issued | 137 |  |  | 199 |
Unused Capacity | $ 363 |  |  |  |
LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 500 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 137 |  |  | 199 |
Unused Capacity | $ 363 |  |  |  |
LGE [Member] | Term Loan Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2019 |  |  |  |
Capacity | $ 200 |  |  |  |
Borrowed | 200 |  | $ 100 | 100 |
Letters of Credit and Commercial Paper Issued | 0 |  |  | 0 |
Unused Capacity | 0 |  |  |  |
KU [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | 598 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 276 |  |  | 243 |
Unused Capacity | $ 322 |  |  |  |
KU [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 400 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 78 |  |  | 45 |
Unused Capacity | $ 322 |  |  |  |
KU [Member] | Letter Of Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2020 |  |  |  |
Capacity | $ 198 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  |  | 198 |
Unused Capacity | $ 0 |  |  |  |
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 650 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 214 |  |  | 1 |
Unused Capacity | $ 436 |  |  |  |
LG And E And KU Energy LLC [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2018 |  |  |  |
Capacity | $ 75 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 0 |  |  | 0 |
Unused Capacity | 75 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | 700 |  |  |  |
Borrowed | 200 |  |  | 100 |
Letters of Credit and Commercial Paper Issued | 137 |  |  | 199 |
Unused Capacity | $ 363 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 500 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 137 |  |  | 199 |
Unused Capacity | $ 363 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Term Loan Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2019 |  |  |  |
Capacity | $ 200 |  |  |  |
Borrowed | 200 |  | 100 | 100 |
Letters of Credit and Commercial Paper Issued | 0 |  |  | 0 |
Unused Capacity | 0 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | 598 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 276 |  |  | 243 |
Unused Capacity | $ 322 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 400 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 78 |  |  | 45 |
Unused Capacity | $ 322 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Letter Of Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2020 |  |  |  |
Capacity | $ 198 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  |  | 198 |
Unused Capacity | 0 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | 700 |  |  |  |
Borrowed | 200 |  |  | 100 |
Letters of Credit and Commercial Paper Issued | 137 |  |  | 199 |
Unused Capacity | $ 363 |  |  |  |
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 500 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 137 |  |  | 199 |
Unused Capacity | $ 363 |  |  |  |
Louisville Gas And Electric Co [Member] | Term Loan Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2019 |  |  |  |
Capacity | $ 200 |  |  |  |
Borrowed | 200 |  | $ 100 | 100 |
Letters of Credit and Commercial Paper Issued | 0 |  |  | 0 |
Unused Capacity | 0 |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | 598 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 276 |  |  | 243 |
Unused Capacity | $ 322 |  |  |  |
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Jan. 31, 2023 |  |  |  |
Capacity | $ 400 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 78 |  |  | 45 |
Unused Capacity | $ 322 |  |  |  |
Kentucky Utilities Co [Member] | Letter Of Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Expiration Date | Oct. 31, 2020 |  |  |  |
Capacity | $ 198 |  |  |  |
Borrowed | 0 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  |  | $ 198 |
Unused Capacity | $ 0 |  |  |  |

X
- Definition The carrying value as of the date borrowed of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a 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. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a 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. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 + Details
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