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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) £ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2018 GBP (£)
Cash Flow Hedges [Member] | Cross Currency Interest Rate Swap Contracts [Member] |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |
Notional amount | $ 702 |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |
Earliest maturity date of cross-currency cash flow hedge contracts | 2021 |  |  |
Latest maturity date of cross-currency cash flow hedge contracts | 2028 |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | $ 0 | $ 0 |  |
Cash Flow Hedges [Member] | Interest Rate Swap Contracts [Member] |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts | For the three months ended March 31, 2018, PPL had no cash flow hedges reclassified into earnings associated with discontinued cash flow hedges. For the three months ended March 31, 2017, PPL had an insignificant amount of cash flow hedges reclassified into earnings associated with discontinued cash flow hedges. |  |  |
No or insignificant unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months | insignificant |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | $ 0 | $ 0 |  |
Net Investment Hedges [Member] | Combined Foreign Currency Contracts And Intercompany Loans [Member] |  |  |  |
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract] |  |  |  |
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI | 20 |  | $ 22 |
Net Investment Hedges [Member] | Foreign Currency Contracts [Member] |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |
Notional amount | $ 195 |  |  | £ 140
Maximum Termination Date Net Investment Hedges Classified As Economic Activity | Jun. 30, 2018 |  |  |
Economic Hedges [Member] | Foreign Currency Contracts [Member] |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |
Maximum Termination Date Net Investment Hedges Classified As Economic Activity | Aug. 31, 2020 |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity | $ 2,900 |  |  | £ 2,100
Minimum Termination Date Net Investment Hedges Classified As Economic Activity | Apr. 30, 2018 |  |  |
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member] |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |
Notional amount | $ 147 |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts | 2033 |  |  |
LGE [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member] |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |
Notional amount | $ 147 |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts | 2033 |  |  |
LGE [Member] | LG And E And KU Energy LLC [Member] | Economic Hedges [Member] | Interest Rate Swap Contracts [Member] |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |
Notional amount | $ 147 |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts | 2033 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The high end of the range of time remaining until maturity when a range is presented for a group of derivatives. + References No definition available. + Details
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- Definition Disclosure of an assertion that the amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period is insignificant or none. + References No definition available. + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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