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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 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
3

 
3

 
—

 
3

Effect of foreign exchange rates
1

 
—

 
—

 
—

Changes in estimated timing or cost (a)
(10
)
 
(10
)
 
(5
)
 
(5
)
Obligations settled
(9
)
 
(9
)
 
(5
)
 
(4
)
Balance at March 31, 2018
$
382

 
$
340

 
$
111

 
$
229


 
(a)
LG&E and KU recorded decreases to the existing AROs during the three months ended March 31, 2018 primarily related to the closure of CCR impoundments and associated groundwater monitoring. These revisions are the result of changes in closure plans related to expected costs and timing of closures. Further changes to AROs, capital plans or operating costs may be required as estimates of future cash flows are refined based on closure developments and regulatory or legal proceedings.
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
3

 
3

 
—

 
3

Effect of foreign exchange rates
1

 
—

 
—

 
—

Changes in estimated timing or cost (a)
(10
)
 
(10
)
 
(5
)
 
(5
)
Obligations settled
(9
)
 
(9
)
 
(5
)
 
(4
)
Balance at March 31, 2018
$
382

 
$
340

 
$
111

 
$
229


 
(a)
LG&E and KU recorded decreases to the existing AROs during the three months ended March 31, 2018 primarily related to the closure of CCR impoundments and associated groundwater monitoring. These revisions are the result of changes in closure plans related to expected costs and timing of closures. Further changes to AROs, capital plans or operating costs may be required as estimates of future cash flows are refined based on closure developments and regulatory or legal proceedings.
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
3

 
3

 
—

 
3

Effect of foreign exchange rates
1

 
—

 
—

 
—

Changes in estimated timing or cost (a)
(10
)
 
(10
)
 
(5
)
 
(5
)
Obligations settled
(9
)
 
(9
)
 
(5
)
 
(4
)
Balance at March 31, 2018
$
382

 
$
340

 
$
111

 
$
229


 
(a)
LG&E and KU recorded decreases to the existing AROs during the three months ended March 31, 2018 primarily related to the closure of CCR impoundments and associated groundwater monitoring. These revisions are the result of changes in closure plans related to expected costs and timing of closures. Further changes to AROs, capital plans or operating costs may be required as estimates of future cash flows are refined based on closure developments and regulatory or legal proceedings.
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
3

 
3

 
—

 
3

Effect of foreign exchange rates
1

 
—

 
—

 
—

Changes in estimated timing or cost (a)
(10
)
 
(10
)
 
(5
)
 
(5
)
Obligations settled
(9
)
 
(9
)
 
(5
)
 
(4
)
Balance at March 31, 2018
$
382

 
$
340

 
$
111

 
$
229


 
(a)
LG&E and KU recorded decreases to the existing AROs during the three months ended March 31, 2018 primarily related to the closure of CCR impoundments and associated groundwater monitoring. These revisions are the result of changes in closure plans related to expected costs and timing of closures. Further changes to AROs, capital plans or operating costs may be required as estimates of future cash flows are refined based on closure developments and regulatory or legal proceedings.