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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 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
Balance at December 31, 2017
$
397

 
$
356

 
$
121

 
$
235

Accretion
10

 
9

 
3

 
6

Effect of foreign exchange rates
(1
)
 
—

 
—

 
—

Changes in estimated timing or cost
1

 
(7
)
 
(2
)
 
(5
)
Obligations settled
(26
)
 
(26
)
 
(10
)
 
(16
)
Balance at June 30, 2018
$
381

 
$
332

 
$
112

 
$
220
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, 2017
$
397

 
$
356

 
$
121

 
$
235

Accretion
10

 
9

 
3

 
6

Effect of foreign exchange rates
(1
)
 
—

 
—

 
—

Changes in estimated timing or cost
1

 
(7
)
 
(2
)
 
(5
)
Obligations settled
(26
)
 
(26
)
 
(10
)
 
(16
)
Balance at June 30, 2018
$
381

 
$
332

 
$
112

 
$
220
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, 2017
$
397

 
$
356

 
$
121

 
$
235

Accretion
10

 
9

 
3

 
6

Effect of foreign exchange rates
(1
)
 
—

 
—

 
—

Changes in estimated timing or cost
1

 
(7
)
 
(2
)
 
(5
)
Obligations settled
(26
)
 
(26
)
 
(10
)
 
(16
)
Balance at June 30, 2018
$
381

 
$
332

 
$
112

 
$
220
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, 2017
$
397

 
$
356

 
$
121

 
$
235

Accretion
10

 
9

 
3

 
6

Effect of foreign exchange rates
(1
)
 
—

 
—

 
—

Changes in estimated timing or cost
1

 
(7
)
 
(2
)
 
(5
)
Obligations settled
(26
)
 
(26
)
 
(10
)
 
(16
)
Balance at June 30, 2018
$
381

 
$
332

 
$
112

 
$
220