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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 16 |  |  | 15 |  |  | 5 |  |  | 10 |
Effect of foreign exchange rates | 2 |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | (70 | ) |  | (63 | ) |  | (12 | ) |  | (51 | )
Obligations settled | (30 | ) |  | (30 | ) |  | (20 | ) |  | (10 | )
Balance at September 30, 2017 | $ | 406 |  |  | $ | 355 |  |  | $ | 118 |  |  | $ | 237 |
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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 16 |  |  | 15 |  |  | 5 |  |  | 10 |
Effect of foreign exchange rates | 2 |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | (70 | ) |  | (63 | ) |  | (12 | ) |  | (51 | )
Obligations settled | (30 | ) |  | (30 | ) |  | (20 | ) |  | (10 | )
Balance at September 30, 2017 | $ | 406 |  |  | $ | 355 |  |  | $ | 118 |  |  | $ | 237 |
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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 16 |  |  | 15 |  |  | 5 |  |  | 10 |
Effect of foreign exchange rates | 2 |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | (70 | ) |  | (63 | ) |  | (12 | ) |  | (51 | )
Obligations settled | (30 | ) |  | (30 | ) |  | (20 | ) |  | (10 | )
Balance at September 30, 2017 | $ | 406 |  |  | $ | 355 |  |  | $ | 118 |  |  | $ | 237 |
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, 2016 | $ | 488 |  |  | $ | 433 |  |  | $ | 145 |  |  | $ | 288 |
Accretion | 16 |  |  | 15 |  |  | 5 |  |  | 10 |
Effect of foreign exchange rates | 2 |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | (70 | ) |  | (63 | ) |  | (12 | ) |  | (51 | )
Obligations settled | (30 | ) |  | (30 | ) |  | (20 | ) |  | (10 | )
Balance at September 30, 2017 | $ | 406 |  |  | $ | 355 |  |  | $ | 118 |  |  | $ | 237 |

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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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