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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details) £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 GBP (£)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] |  |  |
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 Swaps [Member] |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |
Derivative, Notional Amount | 702 |  |
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 | 1,300 |  | £ 859
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 | 32 | $ 31 |
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |
Derivative, Notional Amount | 147 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |
Derivative, Notional Amount | 147 |  |
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |
Derivative, Notional Amount | $ 147 |  |

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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=109980867&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=109980867&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=112277219&loc=d3e80748-113994 + Details
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