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Derivative Instruments and Hedging Activities (Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 154 | $ 135
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 5 | 6
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] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 5 | 6
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member] | Foreign Currency Contracts [Member] |  |
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 | 149 | 129
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] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 149 | 129
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Foreign Currency Contracts [Member] |  |
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] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Foreign Currency Contracts [Member] |  |
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] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Foreign Currency Contracts [Member] |  |
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 | 142 | 202
Liability value | 26 | 22
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 142 | 103
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] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 142 | 103
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 99
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] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 99
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 9 | 6
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 4 | 4
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 5 | 2
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 17 | 16
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 17 | 16
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | 21 | 20
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
LG And E And KU Energy LLC [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
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
LG And E And KU Energy LLC [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
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 4 | 4
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 4 | 4
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 17 | 16
LG And E And KU Energy LLC [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 17 | 16
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 | 21 | 20
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 | 4 | 4
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 | 4 | 4
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 | 17 | 16
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 | $ 17 | $ 16

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