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v3.20.4

New Accounting Guidance Adopted (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Other Noncurrent Assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Right of Use Asset | $ 87
Other Current Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Current | 24
Other Deferred Credits And Noncurrent Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Noncurrent | 70
LG And E And KU Energy LLC [Member] | Other Noncurrent Assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Right of Use Asset | 46
LG And E And KU Energy LLC [Member] | Other Current Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Current | 16
LG And E And KU Energy LLC [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Noncurrent | 37
Louisville Gas And Electric Co [Member] | Other Noncurrent Assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Right of Use Asset | 17
Louisville Gas And Electric Co [Member] | Other Current Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Current | 6
Louisville Gas And Electric Co [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Noncurrent | 15
Kentucky Utilities Co [Member] | Other Noncurrent Assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Right of Use Asset | 27
Kentucky Utilities Co [Member] | Other Current Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Current | 9
Kentucky Utilities Co [Member] | Other Deferred Credits And Noncurrent Liabilities [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Lease Liability - Noncurrent | $ 21

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