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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets [Abstract] |  |
Cash collateral received - eligible for offset | $ 9 | $ 14
Liabilities [Abstract] |  |
Cash collateral pledged - eligible for offset | 1 | 0
Credit Risk-Related Contingent Features [Abstract] |  |
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features | 6 |
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 | 6 |
Treasury Derivatives [Member] |  |
Assets [Abstract] |  |
Gross | 189 | 296
Derivative instruments - eligible for offset | 1 | 5
Cash collateral received - eligible for offset | 9 | 14
Net | 179 | 277
Liabilities [Abstract] |  |
Gross | 35 | 26
Derivative instruments - eligible for offset | 1 | 5
Cash collateral pledged - eligible for offset | 1 | 0
Net | 33 | 21
LG And E And KU Energy LLC [Member] |  |
Assets [Abstract] |  |
Cash collateral received - eligible for offset | 0 | 0
Liabilities [Abstract] |  |
Cash collateral pledged - eligible for offset |  | 0
Credit Risk-Related Contingent Features [Abstract] |  |
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features | 1 |
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 | 1 |
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member] |  |
Assets [Abstract] |  |
Gross | 0 | 0
Derivative instruments - eligible for offset | 0 | 0
Cash collateral received - eligible for offset | 0 | 0
Net | 0 | 0
Liabilities [Abstract] |  |
Gross | 26 | 21
Derivative instruments - eligible for offset | 0 | 0
Cash collateral pledged - eligible for offset | 1 | 0
Net | 25 | 21
Louisville Gas And Electric Co [Member] |  |
Assets [Abstract] |  |
Cash collateral received - eligible for offset | 0 | 0
Liabilities [Abstract] |  |
Cash collateral pledged - eligible for offset | 1 | 0
Credit Risk-Related Contingent Features [Abstract] |  |
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features | 1 |
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 | 1 |
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member] |  |
Assets [Abstract] |  |
Gross | 0 | 0
Derivative instruments - eligible for offset | 0 | 0
Cash collateral received - eligible for offset | 0 | 0
Net | 0 | 0
Liabilities [Abstract] |  |
Gross | 26 | 21
Derivative instruments - eligible for offset | 0 | 0
Cash collateral pledged - eligible for offset | 1 | 0
Net | $ 25 | $ 21

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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. + References No definition available. + Details
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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 The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + 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 (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959 + Details
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- Definition Fair value of 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, elected not to be offset, deducted from derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1)(i) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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