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Asset Retirement Obligations (Tables) | 3 Months Ended
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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.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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