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Derivative Instruments and Hedging Activities - Fair Values (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 0 | $ 0
Liability value | 14 | 18
Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Other current liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 1 | 1
Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Price risk management assets, noncurrent [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Other deferred credits and noncurrent liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 13 | 17
Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 1 | 1
Price risk management assets, current [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 13 | 17
Louisville Gas And Electric Co [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | 14 | 18
Louisville Gas And Electric Co [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Louisville Gas And Electric Co [Member] | Current Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Louisville Gas And Electric Co [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Louisville Gas And Electric Co [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Louisville Gas And Electric Co [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 1 | 1
Louisville Gas And Electric Co [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 1 | 1
Louisville Gas And Electric Co [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 13 | 17
Louisville Gas And Electric Co [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | $ 13 | $ 17

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