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Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2021
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 16. Asset Retirement Obligations (PPL, LG&E and KU) PPL's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For 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 |  | LG&E |  | KU
Balance at December 31, 2020 | $ | 182 |  |  | $ | 67 |  |  | $ | 115 |
Accretion | 12 |  |  | 4 |  |  | 8 |
Changes in estimated timing or cost | 50 |  |  | 34 |  |  | 16 |
Obligations settled | (43) |  |  | (16) |  |  | (27) |
Balance at September 30, 2021 | $ | 201 |  |  | $ | 89 |  |  | $ | 112 |
Louisville Gas And Electric Co [Member] |
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 16. Asset Retirement Obligations (PPL, LG&E and KU) PPL's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For 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 |  | LG&E |  | KU
Balance at December 31, 2020 | $ | 182 |  |  | $ | 67 |  |  | $ | 115 |
Accretion | 12 |  |  | 4 |  |  | 8 |
Changes in estimated timing or cost | 50 |  |  | 34 |  |  | 16 |
Obligations settled | (43) |  |  | (16) |  |  | (27) |
Balance at September 30, 2021 | $ | 201 |  |  | $ | 89 |  |  | $ | 112 |
Kentucky Utilities Co [Member] |
Asset Retirement Obligations [Line Items] |
Asset Retirement Obligations | 16. Asset Retirement Obligations (PPL, LG&E and KU) PPL's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For 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 |  | LG&E |  | KU
Balance at December 31, 2020 | $ | 182 |  |  | $ | 67 |  |  | $ | 115 |
Accretion | 12 |  |  | 4 |  |  | 8 |
Changes in estimated timing or cost | 50 |  |  | 34 |  |  | 16 |
Obligations settled | (43) |  |  | (16) |  |  | (27) |
Balance at September 30, 2021 | $ | 201 |  |  | $ | 89 |  |  | $ | 112 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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