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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2016
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
(PPL, LKE, LG&E and KU)

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
13

 
12

 
4

 
8

Effect of foreign currency exchange rates
(2
)
 
—

 
—

 
—

Obligations settled
(8
)
 
(8
)
 
(6
)
 
(2
)
Balance at June 30, 2016
$
589

 
$
539

 
$
173

 
$
366
LG And E And KU Energy LLC [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
(PPL, LKE, LG&E and KU)

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
13

 
12

 
4

 
8

Effect of foreign currency exchange rates
(2
)
 
—

 
—

 
—

Obligations settled
(8
)
 
(8
)
 
(6
)
 
(2
)
Balance at June 30, 2016
$
589

 
$
539

 
$
173

 
$
366
Louisville Gas And Electric Co [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
(PPL, LKE, LG&E and KU)

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
13

 
12

 
4

 
8

Effect of foreign currency exchange rates
(2
)
 
—

 
—

 
—

Obligations settled
(8
)
 
(8
)
 
(6
)
 
(2
)
Balance at June 30, 2016
$
589

 
$
539

 
$
173

 
$
366
Kentucky Utilities Co [Member]  
Asset Retirement Obligation [Line Items]  
Asset Retirement Obligation Roll Forward
(PPL, LKE, LG&E and KU)

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
13

 
12

 
4

 
8

Effect of foreign currency exchange rates
(2
)
 
—

 
—

 
—

Obligations settled
(8
)
 
(8
)
 
(6
)
 
(2
)
Balance at June 30, 2016
$
589

 
$
539

 
$
173

 
$
366