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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
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
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
ARO at beginning of period | $ | 282 |  |  | $ | 347 |  |  | $ | 215 |  |  | $ | 296 |  |  | $ | 73 |  |  | $ | 103 |  |  | $ | 142 |  |  | $ | 193 |
Accretion | 17 |  |  | 19 |  |  | 15 |  |  | 17 |  |  | 5 |  |  | 6 |  |  | 10 |  |  | 11 |
Obligations incurred | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 38 |  |  | 12 |  |  | 40 |  |  | (2) |  |  | 13 |  |  | (2) |  |  | 27 |  |  | — |
Effect of foreign currency exchange rates | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (88) |  |  | (96) |  |  | (88) |  |  | (96) |  |  | (24) |  |  | (34) |  |  | (64) |  |  | (62) |
ARO at end of period | $ | 250 |  |  | $ | 282 |  |  | $ | 182 |  |  | $ | 215 |  |  | $ | 67 |  |  | $ | 73 |  |  | $ | 115 |  |  | $ | 142 |
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
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
ARO at beginning of period | $ | 282 |  |  | $ | 347 |  |  | $ | 215 |  |  | $ | 296 |  |  | $ | 73 |  |  | $ | 103 |  |  | $ | 142 |  |  | $ | 193 |
Accretion | 17 |  |  | 19 |  |  | 15 |  |  | 17 |  |  | 5 |  |  | 6 |  |  | 10 |  |  | 11 |
Obligations incurred | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 38 |  |  | 12 |  |  | 40 |  |  | (2) |  |  | 13 |  |  | (2) |  |  | 27 |  |  | — |
Effect of foreign currency exchange rates | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (88) |  |  | (96) |  |  | (88) |  |  | (96) |  |  | (24) |  |  | (34) |  |  | (64) |  |  | (62) |
ARO at end of period | $ | 250 |  |  | $ | 282 |  |  | $ | 182 |  |  | $ | 215 |  |  | $ | 67 |  |  | $ | 73 |  |  | $ | 115 |  |  | $ | 142 |
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
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
ARO at beginning of period | $ | 282 |  |  | $ | 347 |  |  | $ | 215 |  |  | $ | 296 |  |  | $ | 73 |  |  | $ | 103 |  |  | $ | 142 |  |  | $ | 193 |
Accretion | 17 |  |  | 19 |  |  | 15 |  |  | 17 |  |  | 5 |  |  | 6 |  |  | 10 |  |  | 11 |
Obligations incurred | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 38 |  |  | 12 |  |  | 40 |  |  | (2) |  |  | 13 |  |  | (2) |  |  | 27 |  |  | — |
Effect of foreign currency exchange rates | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (88) |  |  | (96) |  |  | (88) |  |  | (96) |  |  | (24) |  |  | (34) |  |  | (64) |  |  | (62) |
ARO at end of period | $ | 250 |  |  | $ | 282 |  |  | $ | 182 |  |  | $ | 215 |  |  | $ | 67 |  |  | $ | 73 |  |  | $ | 115 |  |  | $ | 142 |
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
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
ARO at beginning of period | $ | 282 |  |  | $ | 347 |  |  | $ | 215 |  |  | $ | 296 |  |  | $ | 73 |  |  | $ | 103 |  |  | $ | 142 |  |  | $ | 193 |
Accretion | 17 |  |  | 19 |  |  | 15 |  |  | 17 |  |  | 5 |  |  | 6 |  |  | 10 |  |  | 11 |
Obligations incurred | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Changes in estimated timing or cost | 38 |  |  | 12 |  |  | 40 |  |  | (2) |  |  | 13 |  |  | (2) |  |  | 27 |  |  | — |
Effect of foreign currency exchange rates | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Obligations settled | (88) |  |  | (96) |  |  | (88) |  |  | (96) |  |  | (24) |  |  | (34) |  |  | (64) |  |  | (62) |
ARO at end of period | $ | 250 |  |  | $ | 282 |  |  | $ | 182 |  |  | $ | 215 |  |  | $ | 67 |  |  | $ | 73 |  |  | $ | 115 |  |  | $ | 142 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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