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Asset Retirement Obligations | 3 Months Ended
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Mar. 31, 2017
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 15. Asset Retirement Obligations (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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 5 |  |  | 5 |  |  | 2 |  |  | 3 |
Obligations settled | (6 | ) |  | (6 | ) |  | (4 | ) |  | (2 | )
Balance at March 31, 2017 | $ | 487 |  |  | $ | 432 |  |  | $ | 143 |  |  | $ | 289 |
PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 9 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 approved ECR projects for CCRs are amortized to expense over a period of 10 to 25 years based on retirement expenditures made related to the obligation. 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.
LG And E And KU Energy LLC [Member] |
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 15. Asset Retirement Obligations (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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 5 |  |  | 5 |  |  | 2 |  |  | 3 |
Obligations settled | (6 | ) |  | (6 | ) |  | (4 | ) |  | (2 | )
Balance at March 31, 2017 | $ | 487 |  |  | $ | 432 |  |  | $ | 143 |  |  | $ | 289 |
PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 9 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 approved ECR projects for CCRs are amortized to expense over a period of 10 to 25 years based on retirement expenditures made related to the obligation. 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.
Louisville Gas And Electric Co [Member] |
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 15. Asset Retirement Obligations (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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 5 |  |  | 5 |  |  | 2 |  |  | 3 |
Obligations settled | (6 | ) |  | (6 | ) |  | (4 | ) |  | (2 | )
Balance at March 31, 2017 | $ | 487 |  |  | $ | 432 |  |  | $ | 143 |  |  | $ | 289 |
PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 9 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 approved ECR projects for CCRs are amortized to expense over a period of 10 to 25 years based on retirement expenditures made related to the obligation. 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.
Kentucky Utilities Co [Member] |
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 15. Asset Retirement Obligations (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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 5 |  |  | 5 |  |  | 2 |  |  | 3 |
Obligations settled | (6 | ) |  | (6 | ) |  | (4 | ) |  | (2 | )
Balance at March 31, 2017 | $ | 487 |  |  | $ | 432 |  |  | $ | 143 |  |  | $ | 289 |
PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 9 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 approved ECR projects for CCRs are amortized to expense over a period of 10 to 25 years based on retirement expenditures made related to the obligation. 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.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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