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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 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
14

 
13

 
5

 
8

Obligations incurred
8

 
8

 
—

 
8

Effect of foreign exchange rates
(2
)
 
—

 
—

 
—

Changes in estimated timing or cost
(6
)
 
(14
)
 
(2
)
 
(12
)
Obligations settled
(46
)
 
(46
)
 
(17
)
 
(29
)
Balance at September 30, 2018
$
365

 
$
317

 
$
107

 
$
210
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
14

 
13

 
5

 
8

Obligations incurred
8

 
8

 
—

 
8

Effect of foreign exchange rates
(2
)
 
—

 
—

 
—

Changes in estimated timing or cost
(6
)
 
(14
)
 
(2
)
 
(12
)
Obligations settled
(46
)
 
(46
)
 
(17
)
 
(29
)
Balance at September 30, 2018
$
365

 
$
317

 
$
107

 
$
210
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
14

 
13

 
5

 
8

Obligations incurred
8

 
8

 
—

 
8

Effect of foreign exchange rates
(2
)
 
—

 
—

 
—

Changes in estimated timing or cost
(6
)
 
(14
)
 
(2
)
 
(12
)
Obligations settled
(46
)
 
(46
)
 
(17
)
 
(29
)
Balance at September 30, 2018
$
365

 
$
317

 
$
107

 
$
210
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
14

 
13

 
5

 
8

Obligations incurred
8

 
8

 
—

 
8

Effect of foreign exchange rates
(2
)
 
—

 
—

 
—

Changes in estimated timing or cost
(6
)
 
(14
)
 
(2
)
 
(12
)
Obligations settled
(46
)
 
(46
)
 
(17
)
 
(29
)
Balance at September 30, 2018
$
365

 
$
317

 
$
107

 
$
210