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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 0
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member] |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |
Derivative, Notional Amount | 64 |  |
Rhode Island Energy | Economic Hedges [Member] | Gas Contract |  |  |
Interest Rate Risk And Foreign Currency Risk [Line Items] |  |  |
Derivative, Notional Amount | 48 |  |
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 | $ 64 |  |

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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 -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + 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 -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480870/815-30-50-1 + Details
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