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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) £ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2017 GBP (£)
Cash Flow Hedges [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 and nine months ended September 30, 2017, PPL had an insignificant amount of cash flow hedges reclassified into earnings associated with discontinued cash flow hedges. |  |  |
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net |  | $ 0 |  | $ 0 |  |
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 |  |  |
Cash Flow Hedges [Member] | Cross Currency Interest Rate Swap Contracts [Member] |  |  |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |  |  |
Notional amount | $ 802 |  | $ 802 |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |  |
Earliest maturity date of cross-currency cash flow hedge contracts |  |  | 2017 |  |  |
Latest maturity date of cross-currency cash flow hedge contracts |  |  | 2028 |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | 0 | 0 | $ 0 | $ 0 |  |
Cash Flow Hedges [Member] | Interest Rate Swap Contracts [Member] |  |  |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |  |  |
Notional amount | 242 |  | $ 242 |  |  | £ 188
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |  |
Maturity date of interest rate swap cash flow hedge contracts |  |  | 2027 |  |  |
Mandatory Redemption Date of Interest Rate Swap Cash Flow Hedge |  |  | Nov. 30, 2017 |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness | 0 | $ 0 | $ 0 |  |  |
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial |  |  | for the nine months ended September 30, 2016, PPL had an insignificant amount of hedge ineffectiveness associated with interest rate derivatives. |  |  |
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 |  |  | $ 22 |  | $ 21 |
Net Investment Hedges [Member] | Foreign Currency Contracts [Member] |  |  |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |  |  |
Notional amount | 125 |  | 125 |  |  | 92
Economic Hedges [Member] | Interest Rate Swap Contracts [Member] |  |  |  |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |  |  |  |
Notional amount | 147 |  | $ 147 |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts |  |  | 2033 |  |  |
Economic Hedges [Member] | Foreign Currency Contracts [Member] |  |  |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity | 3,700 |  | $ 3,700 |  |  | £ 2,700
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity |  |  | October 2017 |  |  |
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity |  |  | April 2020 |  |  |
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 |  | $ 147 |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts |  |  | 2033 |  |  |
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 |  | $ 147 |  |  |
Interest Rate Risk - Economic Activity (Numeric) [Abstract] |  |  |  |  |  |
Year of expiration of the maximum maturity date of interest rate economic activity contracts |  |  | 2033 |  |  |

X
- 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 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 mandatory redemption date for interest rate swap contracts hedging interest payments on variable rate debt classified as cash flow hedge. Redemption date may occur prior to the mandatory redemption date. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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