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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
ARO at beginning of period
$
397

 
$
488

 
$
356

 
$
433

 
$
121

 
$
145

 
$
235

 
$
288

Accretion
20

 
21

 
18

 
20

 
6

 
7

 
12

 
13

Obligations incurred
8

 
—

 
8

 
—

 
—

 
—

 
8

 
—

Changes in estimated timing or cost
(3
)
 
(73
)
 
(14
)
 
(54
)
 
(2
)
 
(8
)
 
(12
)
 
(46
)
Effect of foreign currency exchange rates
(3
)
 
4

 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(72
)
 
(43
)
 
(72
)
 
(43
)
 
(22
)
 
(23
)
 
(50
)
 
(20
)
ARO at end of period
$
347

 
$
397

 
$
296

 
$
356

 
$
103

 
$
121

 
$
193

 
$
235
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
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
ARO at beginning of period
$
397

 
$
488

 
$
356

 
$
433

 
$
121

 
$
145

 
$
235

 
$
288

Accretion
20

 
21

 
18

 
20

 
6

 
7

 
12

 
13

Obligations incurred
8

 
—

 
8

 
—

 
—

 
—

 
8

 
—

Changes in estimated timing or cost
(3
)
 
(73
)
 
(14
)
 
(54
)
 
(2
)
 
(8
)
 
(12
)
 
(46
)
Effect of foreign currency exchange rates
(3
)
 
4

 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(72
)
 
(43
)
 
(72
)
 
(43
)
 
(22
)
 
(23
)
 
(50
)
 
(20
)
ARO at end of period
$
347

 
$
397

 
$
296

 
$
356

 
$
103

 
$
121

 
$
193

 
$
235
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
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
ARO at beginning of period
$
397

 
$
488

 
$
356

 
$
433

 
$
121

 
$
145

 
$
235

 
$
288

Accretion
20

 
21

 
18

 
20

 
6

 
7

 
12

 
13

Obligations incurred
8

 
—

 
8

 
—

 
—

 
—

 
8

 
—

Changes in estimated timing or cost
(3
)
 
(73
)
 
(14
)
 
(54
)
 
(2
)
 
(8
)
 
(12
)
 
(46
)
Effect of foreign currency exchange rates
(3
)
 
4

 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(72
)
 
(43
)
 
(72
)
 
(43
)
 
(22
)
 
(23
)
 
(50
)
 
(20
)
ARO at end of period
$
347

 
$
397

 
$
296

 
$
356

 
$
103

 
$
121

 
$
193

 
$
235
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
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
ARO at beginning of period
$
397

 
$
488

 
$
356

 
$
433

 
$
121

 
$
145

 
$
235

 
$
288

Accretion
20

 
21

 
18

 
20

 
6

 
7

 
12

 
13

Obligations incurred
8

 
—

 
8

 
—

 
—

 
—

 
8

 
—

Changes in estimated timing or cost
(3
)
 
(73
)
 
(14
)
 
(54
)
 
(2
)
 
(8
)
 
(12
)
 
(46
)
Effect of foreign currency exchange rates
(3
)
 
4

 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(72
)
 
(43
)
 
(72
)
 
(43
)
 
(22
)
 
(23
)
 
(50
)
 
(20
)
ARO at end of period
$
347

 
$
397

 
$
296

 
$
356

 
$
103

 
$
121

 
$
193

 
$
235