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Derivative Instruments and Hedging Activities (Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 0 | $ 0
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 25 | 0
Liability value | 73 | 18
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 20 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 20 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 5 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 5 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 63 | 1
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 1 | 1
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 62 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 10 | 17
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 6 | 17
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Gas Contract |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 4 | 0
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | 7 | 18
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [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] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [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] | Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 1 | 1
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [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] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 6 | 17
Louisville Gas And Electric Co [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | $ 6 | $ 17

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