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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2015
$
586

 
$
535

 
$
175

 
$
360

Accretion
20

 
18

 
6

 
12

Effect of foreign currency exchange rates
(7
)
 
—

 
—

 
—

Changes in estimated timing or cost
(116
)
 
(116
)
 
(24
)
 
(92
)
Obligations settled
(15
)
 
(15
)
 
(11
)
 
(4
)
Balance at September 30, 2016
$
468

 
$
422

 
$
146

 
$
276
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, 2015
$
586

 
$
535

 
$
175

 
$
360

Accretion
20

 
18

 
6

 
12

Effect of foreign currency exchange rates
(7
)
 
—

 
—

 
—

Changes in estimated timing or cost
(116
)
 
(116
)
 
(24
)
 
(92
)
Obligations settled
(15
)
 
(15
)
 
(11
)
 
(4
)
Balance at September 30, 2016
$
468

 
$
422

 
$
146

 
$
276
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, 2015
$
586

 
$
535

 
$
175

 
$
360

Accretion
20

 
18

 
6

 
12

Effect of foreign currency exchange rates
(7
)
 
—

 
—

 
—

Changes in estimated timing or cost
(116
)
 
(116
)
 
(24
)
 
(92
)
Obligations settled
(15
)
 
(15
)
 
(11
)
 
(4
)
Balance at September 30, 2016
$
468

 
$
422

 
$
146

 
$
276
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, 2015
$
586

 
$
535

 
$
175

 
$
360

Accretion
20

 
18

 
6

 
12

Effect of foreign currency exchange rates
(7
)
 
—

 
—

 
—

Changes in estimated timing or cost
(116
)
 
(116
)
 
(24
)
 
(92
)
Obligations settled
(15
)
 
(15
)
 
(11
)
 
(4
)
Balance at September 30, 2016
$
468

 
$
422

 
$
146

 
$
276