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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2018
Asset Retirement Obligations [Line Items]  
Asset Retirement Obligations
16. Asset Retirement Obligations

(PPL, LKE, LG&E and KU)

PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 10 for information on the final CCR rule. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability.

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 Obligations [Line Items]  
Asset Retirement Obligations
16. Asset Retirement Obligations

(PPL, LKE, LG&E and KU)

PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 10 for information on the final CCR rule. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability.

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 Obligations [Line Items]  
Asset Retirement Obligations
16. Asset Retirement Obligations

(PPL, LKE, LG&E and KU)

PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 10 for information on the final CCR rule. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability.

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 Obligations [Line Items]  
Asset Retirement Obligations
16. Asset Retirement Obligations

(PPL, LKE, LG&E and KU)

PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 10 for information on the final CCR rule. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability.

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.