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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 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 | 10 |  |  | 9 |  |  | 3 |  |  | 6 |
Effect of foreign exchange rates | (1 | ) |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 1 |  |  | (7 | ) |  | (2 | ) |  | (5 | )
Obligations settled | (26 | ) |  | (26 | ) |  | (10 | ) |  | (16 | )
Balance at June 30, 2018 | $ | 381 |  |  | $ | 332 |  |  | $ | 112 |  |  | $ | 220 |
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 | 10 |  |  | 9 |  |  | 3 |  |  | 6 |
Effect of foreign exchange rates | (1 | ) |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 1 |  |  | (7 | ) |  | (2 | ) |  | (5 | )
Obligations settled | (26 | ) |  | (26 | ) |  | (10 | ) |  | (16 | )
Balance at June 30, 2018 | $ | 381 |  |  | $ | 332 |  |  | $ | 112 |  |  | $ | 220 |
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 | 10 |  |  | 9 |  |  | 3 |  |  | 6 |
Effect of foreign exchange rates | (1 | ) |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 1 |  |  | (7 | ) |  | (2 | ) |  | (5 | )
Obligations settled | (26 | ) |  | (26 | ) |  | (10 | ) |  | (16 | )
Balance at June 30, 2018 | $ | 381 |  |  | $ | 332 |  |  | $ | 112 |  |  | $ | 220 |
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 | 10 |  |  | 9 |  |  | 3 |  |  | 6 |
Effect of foreign exchange rates | (1 | ) |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 1 |  |  | (7 | ) |  | (2 | ) |  | (5 | )
Obligations settled | (26 | ) |  | (26 | ) |  | (10 | ) |  | (16 | )
Balance at June 30, 2018 | $ | 381 |  |  | $ | 332 |  |  | $ | 112 |  |  | $ | 220 |

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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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