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Derivative Instruments and Hedging Activities - Risk Disclosures (Details) $ in Millions, £ in Billions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 GBP (£)
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] |  |  |  |
Earliest maturity date of cross-currency cash flow hedge contracts | 2021 |  |  |
Latest maturity date of cross-currency cash flow hedge contracts | 2028 |  |  |
Notional amount | $ 702 |  |  |
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 | $ 31 |  | $ 31 |
Economic Hedges [Member] | Foreign Currency Contracts [Member] |  |  |  |
Foreign Currency Risk - Economic Activity (Numeric) [Abstract] |  |  |  |
Minimum Termination Date Net Investment Hedges Classified As Economic Activity | Apr. 30, 2019 |  |  |
Maximum Termination Date Net Investment Hedges Classified As Economic Activity | Oct. 31, 2020 |  |  |
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity | $ 1,800 |  |  | £ 1.3
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |
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 |  |  |
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] |  |  |  |
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 |  |  |
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |  |
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract] |  |  |  |
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 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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