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Specific to commercial paper.No definition available.false0Weighted-average interest rate on outstanding commercial paper36false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse16false USDtruefalseFROM_Jan01_2013_TO_Jun30_2013_dei_LegalEntityAxis_LGAndEAndKUEnergyLLCMember_ppl_ByCompanyAxis_KentuckyUtilitiesCompanyMember_us-gaap_ShortTermDebtTypeAxis_CommercialPaperMemberhttp://www.sec.gov/CIK0000922224duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseLG And E And KU Energy LLC [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldippl_LGAndEAndKUEnergyLLCMemberdei_LegalEntityAxisexplicitMemberfalsefalseKU [Member]ppl_ByCompanyAxisxbrldihttp://xbrl.org/2006/xbrldippl_KentuckyUtilitiesCompanyMemberppl_ByCompanyAxisexplicitMemberfalsefalseCommercial Paper [Member]us-gaap_ShortTermDebtTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_ShortTermDebtTypeAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0LG And E And KU Energy LLC [Member] | KU [Member]37true 3us-gaap_ShortTermDebtLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Short-term Debt [Line Items]38false 4ppl_ShortTermDebtMaximumBorrowingCapacityppl_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse350000000350USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse250000000250USD$falsefalsefalsexbrli:monetaryItemTypemonetaryMaximum borrowing capacity under the short-term credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.No definition available.false2Capacity39false 4us-gaap_CommercialPaperus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse172000000172USD$falsefalsefalse2truefalsefalse7000000070USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. 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The maturities of these money market securities generally do not exceed 270 days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a(3) -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2 -Article 9 false2Commercial paper outstanding50false 4ppl_WeightedAverageInterestRateOutstandingCommercialPaperppl_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.00330.0033falsefalsefalse2truetruefalse0.00420.0042falsefalsefalse3falsefalsefalse00falsefalsefalsenum:percentItemTypepureReflects the calculation of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time. 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