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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2020
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
The changes in the carrying amounts of AROs were as follows.
 
PPL
 
LKE
 
LG&E
 
KU
Balance at December 31, 2019
$
282

 
$
215

 
$
73

 
$
142

Accretion
4

 
4

 
1

 
3

Changes in estimated timing or cost
18

 
18

 
—

 
18

Obligations settled
(20
)
 
(20
)
 
(7
)
 
(13
)
Balance at March 31, 2020
$
284

 
$
217

 
$
67

 
$
150
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.
 
PPL
 
LKE
 
LG&E
 
KU
Balance at December 31, 2019
$
282

 
$
215

 
$
73

 
$
142

Accretion
4

 
4

 
1

 
3

Changes in estimated timing or cost
18

 
18

 
—

 
18

Obligations settled
(20
)
 
(20
)
 
(7
)
 
(13
)
Balance at March 31, 2020
$
284

 
$
217

 
$
67

 
$
150
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.
 
PPL
 
LKE
 
LG&E
 
KU
Balance at December 31, 2019
$
282

 
$
215

 
$
73

 
$
142

Accretion
4

 
4

 
1

 
3

Changes in estimated timing or cost
18

 
18

 
—

 
18

Obligations settled
(20
)
 
(20
)
 
(7
)
 
(13
)
Balance at March 31, 2020
$
284

 
$
217

 
$
67

 
$
150
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.
 
PPL
 
LKE
 
LG&E
 
KU
Balance at December 31, 2019
$
282

 
$
215

 
$
73

 
$
142

Accretion
4

 
4

 
1

 
3

Changes in estimated timing or cost
18

 
18

 
—

 
18

Obligations settled
(20
)
 
(20
)
 
(7
)
 
(13
)
Balance at March 31, 2020
$
284

 
$
217

 
$
67

 
$
150