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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows:
 PPLLG&EKU
 202120202021202020212020
ARO at beginning of period$182 $215 $67 $73 $115 $142 
Accretion16 15 5 5 11 10 
Changes in estimated timing or cost56 40 40 13 16 27 
Obligations settled(65)(88)(28)(24)(37)(64)
ARO at end of period$189 $182 $84 $67 $105 $115 
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
 202120202021202020212020
ARO at beginning of period$182 $215 $67 $73 $115 $142 
Accretion16 15 5 5 11 10 
Changes in estimated timing or cost56 40 40 13 16 27 
Obligations settled(65)(88)(28)(24)(37)(64)
ARO at end of period$189 $182 $84 $67 $105 $115 
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
 202120202021202020212020
ARO at beginning of period$182 $215 $67 $73 $115 $142 
Accretion16 15 5 5 11 10 
Changes in estimated timing or cost56 40 40 13 16 27 
Obligations settled(65)(88)(28)(24)(37)(64)
ARO at end of period$189 $182 $84 $67 $105 $115