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Derivative Instruments and Hedging Activities (Fair Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives Designated As Hedging Instruments [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value $ 135 $ 101
Liability value 0 0
Derivatives Designated As Hedging Instruments [Member] | Current Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 6 4
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 6 4
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 129 97
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 129 97
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 202 163
Liability value 22 174
Derivatives Not Designated As Hedging Instruments [Member] | Current Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 103 45
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 103 45
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Asset value 99 118
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 99 118
Derivatives Not Designated As Hedging Instruments [Member] | Current Liabilities [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 6 71
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 2 67
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 16 103
Derivatives Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]    
Fair Values by Balance Sheet Location [Abstract]    
Liability value 16 22
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 81
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 20 26
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 16 22
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 16 22
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 20 26
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 16 22
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 $ 16 $ 22