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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows:
 PPLLKELG&EKU
 20202019202020192020201920202019
ARO at beginning of period$282 $347 $215 $296 $73 $103 $142 $193 
Accretion17 19 15 17 5 6 10 11 
Obligations incurred— — — — — — — — 
Changes in estimated timing or cost38 12 40 (2)13 (2)27 — 
Effect of foreign currency exchange rates1 — — — — — — — 
Obligations settled(88)(96)(88)(96)(24)(34)(64)(62)
ARO at end of period$250 $282 $182 $215 $67 $73 $115 $142 
LG And E And KU Energy LLC [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows:
 PPLLKELG&EKU
 20202019202020192020201920202019
ARO at beginning of period$282 $347 $215 $296 $73 $103 $142 $193 
Accretion17 19 15 17 5 6 10 11 
Obligations incurred— — — — — — — — 
Changes in estimated timing or cost38 12 40 (2)13 (2)27 — 
Effect of foreign currency exchange rates1 — — — — — — — 
Obligations settled(88)(96)(88)(96)(24)(34)(64)(62)
ARO at end of period$250 $282 $182 $215 $67 $73 $115 $142 
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:
 PPLLKELG&EKU
 20202019202020192020201920202019
ARO at beginning of period$282 $347 $215 $296 $73 $103 $142 $193 
Accretion17 19 15 17 5 6 10 11 
Obligations incurred— — — — — — — — 
Changes in estimated timing or cost38 12 40 (2)13 (2)27 — 
Effect of foreign currency exchange rates1 — — — — — — — 
Obligations settled(88)(96)(88)(96)(24)(34)(64)(62)
ARO at end of period$250 $282 $182 $215 $67 $73 $115 $142 
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:
 PPLLKELG&EKU
 20202019202020192020201920202019
ARO at beginning of period$282 $347 $215 $296 $73 $103 $142 $193 
Accretion17 19 15 17 5 6 10 11 
Obligations incurred— — — — — — — — 
Changes in estimated timing or cost38 12 40 (2)13 (2)27 — 
Effect of foreign currency exchange rates1 — — — — — — — 
Obligations settled(88)(96)(88)(96)(24)(34)(64)(62)
ARO at end of period$250 $282 $182 $215 $67 $73 $115 $142