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Commitments and Contingencies - Guarantees and Other Assurances (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Integer
Dec. 31, 2018
USD ($)
Guarantor Obligations [Line Items]    
Recorded liability for all guarantees $ 5 $ 6
Other Guarantee (Numeric) [Abstract]    
Maximum aggregate coverage bodily injury and property damage $ 225  
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Indemnifications Related To WPD Midlands Acquisition [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure is not estimable The maximum exposure and expiration of these indemnifications cannot be estimated because the maximum potential liability is not capped and the expiration date is not specified in the transaction documents.  
PPL Guarantee [Member] | Indemnification Guarantee [Member] | WPD Indemnifications For Entities In Liquidation and Sales Of Assets [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure $ 10  
Minimum Period In Years That Indemnifications Generally Expire | Integer 2  
Maximum Period In Years That Indemnifications Generally Expire | Integer 7  
PPL Guarantee [Member] | Financial Guarantee [Member] | WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure $ 79  
PPL Electric Guarantee [Member] | Indemnification Guarantee [Member] | Guarantee Of Inventory Value [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure 10  
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure $ 200  
Term of guarantee (in years) P12Y  
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues $ 200  
LKE Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable.  
Contingent proportionate share of OVEC's outstanding debt $ 112  
PPL Electric Utilities Corp [Member] | Indemnification Guarantee [Member] | Guarantee Of Inventory Value [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure 10  
LG And E And KU Energy LLC [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure $ 200  
Term of guarantee (in years) P12Y  
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues $ 200  
LG And E And KU Energy LLC [Member] | LGE And KU Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable.  
Contingent proportionate share of OVEC's outstanding debt $ 112  
Louisville Gas And Electric Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable.  
Contingent proportionate share of OVEC's outstanding debt $ 77  
Kentucky Utilities Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]    
Guarantor Obligations [Line Items]    
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable.  
Contingent proportionate share of OVEC's outstanding debt $ 35