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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2021
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 PPLLG&EKU
Balance at December 31, 2020$182 $67 $115 
Accretion8 3 5 
Changes in estimated timing or cost15 5 10 
Obligations settled(33)(15)(18)
Balance at June 30, 2021$172 $60 $112 
Louisville Gas And Electric Co [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 PPLLG&EKU
Balance at December 31, 2020$182 $67 $115 
Accretion8 3 5 
Changes in estimated timing or cost15 5 10 
Obligations settled(33)(15)(18)
Balance at June 30, 2021$172 $60 $112 
Kentucky Utilities Co [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 PPLLG&EKU
Balance at December 31, 2020$182 $67 $115 
Accretion8 3 5 
Changes in estimated timing or cost15 5 10 
Obligations settled(33)(15)(18)
Balance at June 30, 2021$172 $60 $112