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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 0 | $ 146
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 94
Designated As Hedging Instruments [Member] | Other current liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 94
Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 52
Designated As Hedging Instruments [Member] | Price risk management assets, noncurrent [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Designated As Hedging Instruments [Member] | Other deferred credits and noncurrent liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Price risk management assets, current [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current assets held for sale via noncurrent assets [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 52
Designated As Hedging Instruments [Member] | Current liabilities held for sale via noncurrent liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Not Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | 20 | 160
Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Other current liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 2 | 2
Not Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Price risk management assets, noncurrent [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Other deferred credits and noncurrent liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 18 | 21
Not Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Not Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 137
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 2 | 139
Not Designated As Hedging Instruments [Member] | Price risk management assets, current [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 18 | 21
Not Designated As Hedging Instruments [Member] | Current assets held for sale via noncurrent assets [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Current liabilities held for sale via noncurrent liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | 20 | 23
Louisville Gas And Electric Co [Member] | 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] | 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] | 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] | 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] | Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 2 | 2
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 2 | 2
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 18 | 21
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | $ 18 | $ 21

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