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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 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
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
ARO at beginning of period | $ | 488 |  |  | $ | 586 |  |  | $ | 433 |  |  | $ | 535 |  |  | $ | 145 |  |  | $ | 175 |  |  | $ | 288 |  |  | $ | 360 |
Accretion | 21 |  |  | 24 |  |  | 20 |  |  | 22 |  |  | 7 |  |  | 7 |  |  | 13 |  |  | 15 |
Changes in estimated timing or cost (a) | (73 | ) |  | (84 | ) |  | (54 | ) |  | (95 | ) |  | (8 | ) |  | (19 | ) |  | (46 | ) |  | (76 | )
Effect of foreign currency exchange rates | 4 |  |  | (9 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (43 | ) |  | (29 | ) |  | (43 | ) |  | (29 | ) |  | (23 | ) |  | (18 | ) |  | (20 | ) |  | (11 | )
ARO at end of period | $ | 397 |  |  | $ | 488 |  |  | $ | 356 |  |  | $ | 433 |  |  | $ | 121 |  |  | $ | 145 |  |  | $ | 235 |  |  | $ | 288 |
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
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
ARO at beginning of period | $ | 488 |  |  | $ | 586 |  |  | $ | 433 |  |  | $ | 535 |  |  | $ | 145 |  |  | $ | 175 |  |  | $ | 288 |  |  | $ | 360 |
Accretion | 21 |  |  | 24 |  |  | 20 |  |  | 22 |  |  | 7 |  |  | 7 |  |  | 13 |  |  | 15 |
Changes in estimated timing or cost (a) | (73 | ) |  | (84 | ) |  | (54 | ) |  | (95 | ) |  | (8 | ) |  | (19 | ) |  | (46 | ) |  | (76 | )
Effect of foreign currency exchange rates | 4 |  |  | (9 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (43 | ) |  | (29 | ) |  | (43 | ) |  | (29 | ) |  | (23 | ) |  | (18 | ) |  | (20 | ) |  | (11 | )
ARO at end of period | $ | 397 |  |  | $ | 488 |  |  | $ | 356 |  |  | $ | 433 |  |  | $ | 121 |  |  | $ | 145 |  |  | $ | 235 |  |  | $ | 288 |
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
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
ARO at beginning of period | $ | 488 |  |  | $ | 586 |  |  | $ | 433 |  |  | $ | 535 |  |  | $ | 145 |  |  | $ | 175 |  |  | $ | 288 |  |  | $ | 360 |
Accretion | 21 |  |  | 24 |  |  | 20 |  |  | 22 |  |  | 7 |  |  | 7 |  |  | 13 |  |  | 15 |
Changes in estimated timing or cost (a) | (73 | ) |  | (84 | ) |  | (54 | ) |  | (95 | ) |  | (8 | ) |  | (19 | ) |  | (46 | ) |  | (76 | )
Effect of foreign currency exchange rates | 4 |  |  | (9 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (43 | ) |  | (29 | ) |  | (43 | ) |  | (29 | ) |  | (23 | ) |  | (18 | ) |  | (20 | ) |  | (11 | )
ARO at end of period | $ | 397 |  |  | $ | 488 |  |  | $ | 356 |  |  | $ | 433 |  |  | $ | 121 |  |  | $ | 145 |  |  | $ | 235 |  |  | $ | 288 |
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
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
ARO at beginning of period | $ | 488 |  |  | $ | 586 |  |  | $ | 433 |  |  | $ | 535 |  |  | $ | 145 |  |  | $ | 175 |  |  | $ | 288 |  |  | $ | 360 |
Accretion | 21 |  |  | 24 |  |  | 20 |  |  | 22 |  |  | 7 |  |  | 7 |  |  | 13 |  |  | 15 |
Changes in estimated timing or cost (a) | (73 | ) |  | (84 | ) |  | (54 | ) |  | (95 | ) |  | (8 | ) |  | (19 | ) |  | (46 | ) |  | (76 | )
Effect of foreign currency exchange rates | 4 |  |  | (9 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (43 | ) |  | (29 | ) |  | (43 | ) |  | (29 | ) |  | (23 | ) |  | (18 | ) |  | (20 | ) |  | (11 | )
ARO at end of period | $ | 397 |  |  | $ | 488 |  |  | $ | 356 |  |  | $ | 433 |  |  | $ | 121 |  |  | $ | 145 |  |  | $ | 235 |  |  | $ | 288 |

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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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