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Derivative Instruments and Hedging Activities (Offsetting Derivative Instruments and Credit Risk-Related Features) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets |  | $ 14
Cash collateral pledged eligible for offset - liabilities | $ 0 | 0
Credit Risk-Related Contingent Features [Abstract] |  |
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features | 102 |
Aggregate fair value of collateral posted on these derivative instruments | 0 |
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade | 102 |
Treasury Derivatives [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Gross assets | 146 | 296
Derivative instruments eligible for offset - assets | 34 | 5
Cash collateral received eligible for offset - assets | 0 | 14
Net assets | 112 | 277
Gross liabilities | 160 | 26
Derivative instruments eligible for offset - liabilities | 34 | 5
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Net liabilities | 126 | 21
LG And E And KU Energy LLC [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets | 0 | 0
Cash collateral pledged eligible for offset - liabilities |  | 0
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Gross assets | 0 | 0
Derivative instruments eligible for offset - assets | 0 | 0
Cash collateral received eligible for offset - assets | 0 | 0
Net assets | 0 | 0
Gross liabilities | 23 | 21
Derivative instruments eligible for offset - liabilities | 0 | 0
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Net liabilities | 23 | 21
Louisville Gas And Electric Co [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets | 0 | 0
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Gross assets | 0 | 0
Derivative instruments eligible for offset - assets | 0 | 0
Cash collateral received eligible for offset - assets | 0 | 0
Net assets | 0 | 0
Gross liabilities | 23 | 21
Derivative instruments eligible for offset - liabilities | 0 | 0
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Net liabilities | 23 | 21
Kentucky Utilities Co [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets | 0 | 0
Cash collateral pledged eligible for offset - liabilities | $ 0 | $ 0

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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