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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) £ in Millions, $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2020 GBP (£) | Sep. 30, 2020 USD ($)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net | $ 0 | $ 0 |  |  |
Cash Flow Hedges [Member] | Cross Currency Interest Rate Swap Contracts [Member] |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 702
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Derivative, Notional Amount |  |  |  | £ 126 | 168
Net Investment Hedges [Member] | Foreign Currency Contracts [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 | $ 33 |  | $ 32 |  |
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 |  |  |  | £ 340 | 482
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | 147
LG And E And KU Energy LLC [Member] | LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | 147
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 147

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- Definition Total exposure hedged through a combination of average rate forwards and average rate options foreign currency contracts for anticipated earnings hedges classified as economic activity. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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- Definition The amount of net gain (loss) reclassified into earnings when interest rate 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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