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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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
11

 
10

 
4

 
6

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(73
)
 
(66
)
 
(10
)
 
(56
)
Obligations settled
(12
)
 
(12
)
 
(7
)
 
(5
)
Balance at June 30, 2017
$
416

 
$
365

 
$
132

 
$
233
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
11

 
10

 
4

 
6

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(73
)
 
(66
)
 
(10
)
 
(56
)
Obligations settled
(12
)
 
(12
)
 
(7
)
 
(5
)
Balance at June 30, 2017
$
416

 
$
365

 
$
132

 
$
233
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
11

 
10

 
4

 
6

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(73
)
 
(66
)
 
(10
)
 
(56
)
Obligations settled
(12
)
 
(12
)
 
(7
)
 
(5
)
Balance at June 30, 2017
$
416

 
$
365

 
$
132

 
$
233
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
11

 
10

 
4

 
6

Effect of foreign exchange rates
2

 
—

 
—

 
—

Changes in estimated timing or cost
(73
)
 
(66
)
 
(10
)
 
(56
)
Obligations settled
(12
)
 
(12
)
 
(7
)
 
(5
)
Balance at June 30, 2017
$
416

 
$
365

 
$
132

 
$
233