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Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term Debt [Line Items] |  |
Capacity | $ 2,350 |
Commercial Paper Issuances | 1,315 | $ 474
Unused Capacity | $ 1,035 |
PPL Capital Funding [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.42% | 1.64%
Capacity | $ 1,000 |
Commercial Paper Issuances | 999 | $ 230
Unused Capacity | $ 1 |
PPL Electric [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate |  |
Capacity | $ 650 |
Commercial Paper Issuances | 0 | $ 0
Unused Capacity | $ 650 |
LGE [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.33% | 1.83%
Capacity | $ 350 |
Commercial Paper Issuances | 183 | $ 199
Unused Capacity | $ 167 |
KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.34% | 1.97%
Capacity | $ 350 |
Commercial Paper Issuances | 133 | $ 45
Unused Capacity | $ 217 |
PPL Electric Utilities Corp [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate |  |
Capacity | $ 650 |
Commercial Paper Issuances | 0 | $ 0
Unused Capacity | $ 650 |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.33% | 1.83%
Capacity | $ 350 |
Commercial Paper Issuances | 183 | $ 199
Unused Capacity | $ 167 |
LG And E And KU Energy LLC [Member] | KU [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.34% | 1.97%
Capacity | $ 350 |
Commercial Paper Issuances | 133 | $ 45
Unused Capacity | $ 217 |
Louisville Gas And Electric Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.33% | 1.83%
Capacity | $ 350 |
Commercial Paper Issuances | 183 | $ 199
Unused Capacity | $ 167 |
Kentucky Utilities Co [Member] |  |
Short-term Debt [Line Items] |  |
Weighted - Average Interest Rate | 2.34% | 1.97%
Capacity | $ 350 |
Commercial Paper Issuances | 133 | $ 45
Unused Capacity | $ 217 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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)(a)(3)) -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(a)(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(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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