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Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 179 | $ 188
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 32 | 32
Designated As Hedging Instruments [Member] | Current Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Designated As Hedging Instruments [Member] | Current Assets [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 32 | 32
Designated As Hedging Instruments [Member] | Current Assets [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 | 147 | 156
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 147 | 156
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset 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] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability 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] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Foreign Currency Contracts [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 | 200 | 211
Liability value | 79 | 58
Not Designated As Hedging Instruments [Member] | Current Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 63 | 31
Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 63 | 31
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 137 | 180
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 137 | 180
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 47 | 25
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 4 | 4
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 43 | 21
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 32 | 33
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 25 | 27
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Cross Currency Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 0 | 0
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Foreign Currency Contracts [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 7 | 6
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | 29 | 31
LG And E And KU Energy LLC [Member] | 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] | 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] | 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] | 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] | 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] | 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] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 25 | 27
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 25 | 27
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 | 29 | 31
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 | 4 | 4
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 | 4 | 4
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 25 | 27
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 | $ 25 | $ 27

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