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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2016
$
488

 
$
433

 
$
145

 
$
288

Accretion
16

 
15

 
5

 
10

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(70
)
 
(63
)
 
(12
)
 
(51
)
Obligations settled
(30
)
 
(30
)
 
(20
)
 
(10
)
Balance at September 30, 2017
$
406

 
$
355

 
$
118

 
$
237
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, 2016
$
488

 
$
433

 
$
145

 
$
288

Accretion
16

 
15

 
5

 
10

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(70
)
 
(63
)
 
(12
)
 
(51
)
Obligations settled
(30
)
 
(30
)
 
(20
)
 
(10
)
Balance at September 30, 2017
$
406

 
$
355

 
$
118

 
$
237
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, 2016
$
488

 
$
433

 
$
145

 
$
288

Accretion
16

 
15

 
5

 
10

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(70
)
 
(63
)
 
(12
)
 
(51
)
Obligations settled
(30
)
 
(30
)
 
(20
)
 
(10
)
Balance at September 30, 2017
$
406

 
$
355

 
$
118

 
$
237
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, 2016
$
488

 
$
433

 
$
145

 
$
288

Accretion
16

 
15

 
5

 
10

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(70
)
 
(63
)
 
(12
)
 
(51
)
Obligations settled
(30
)
 
(30
)
 
(20
)
 
(10
)
Balance at September 30, 2017
$
406

 
$
355

 
$
118

 
$
237