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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contracts with Customers [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended June 30.
| 2021 Three Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 567 |  |  | $ | 279 |  |  | $ | 144 |  |  | $ | 144 |
Commercial | 297 |  |  | 83 |  |  | 107 |  |  | 107 |
Industrial | 154 |  |  | 13 |  |  | 43 |  |  | 98 |
Other (a) | 93 |  |  | 13 |  |  | 31 |  |  | 39 |
Wholesale - municipality | 5 |  |  | — |  |  | — |  |  | 5 |
Wholesale - other (b) | 13 |  |  | — |  |  | 14 |  |  | 11 |
Transmission | 173 |  |  | 173 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,302 |  |  | $ | 561 |  |  | $ | 339 |  |  | $ | 404 |
| 2020 Three Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 583 |  |  | $ | 290 |  |  | $ | 149 |  |  | $ | 144 |
Commercial | 274 |  |  | 74 |  |  | 100 |  |  | 100 |
Industrial | 134 |  |  | 12 |  |  | 38 |  |  | 84 |
Other (a) | 83 |  |  | 12 |  |  | 28 |  |  | 34 |
Wholesale - municipality | 3 |  |  | — |  |  | — |  |  | 3 |
Wholesale - other (b) | 9 |  |  | — |  |  | 5 |  |  | 14 |
Transmission | 164 |  |  | 164 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,250 |  |  | $ | 552 |  |  | $ | 320 |  |  | $ | 379 |
| 2021 Six Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 1,341 |  |  | $ | 640 |  |  | $ | 349 |  |  | $ | 352 |
Commercial | 610 |  |  | 165 |  |  | 228 |  |  | 217 |
Industrial | 306 |  |  | 25 |  |  | 89 |  |  | 192 |
Other (a) | 184 |  |  | 25 |  |  | 65 |  |  | 76 |
Wholesale - municipality | 11 |  |  | — |  |  | — |  |  | 11 |
Wholesale - other (b) | 33 |  |  | — |  |  | 33 |  |  | 24 |
Transmission | 333 |  |  | 333 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 2,818 |  |  | $ | 1,188 |  |  | $ | 764 |  |  | $ | 872 |
| 2020 Six Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 1,297 |  |  | $ | 634 |  |  | $ | 336 |  |  | $ | 327 |
Commercial | 586 |  |  | 155 |  |  | 224 |  |  | 207 |
Industrial | 278 |  |  | 20 |  |  | 83 |  |  | 175 |
Other (a) | 170 |  |  | 26 |  |  | 56 |  |  | 72 |
Wholesale - municipality | 8 |  |  | — |  |  | — |  |  | 8 |
Wholesale - other (b) | 17 |  |  | — |  |  | 22 |  |  | 19 |
Transmission | 323 |  |  | 323 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 2,679 |  |  | $ | 1,158 |  |  | $ | 721 |  |  | $ | 808 |
(a)Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses. (b)Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at the Kentucky Regulated segment.
Credit Loss Recognized from Contracts with Customers [Table Text Block] | The following table shows the accounts receivable and unbilled revenues balances that were impaired for the periods ended June 30.
| Three Months |  | Six Months
| 2021 |  | 2020 |  | 2021 |  | 2020
PPL | $ | — |  |  | $ | 6 |  |  | $ | 2 |  |  | $ | 12 |
PPL Electric | — |  |  | 5 |  |  | 1 |  |  | 9 |
LG&E | — |  |  | — |  |  | — |  |  | 1 |
KU | — |  |  | 1 |  |  | 1 |  |  | 2 |
Contract with Customer, Asset and Liability [Table Text Block] | The following table shows the balances and certain activity of contract liabilities resulting from contracts with customers.
| PPL |  | PPL Electric |  | LG&E |  | KU
Contract liabilities at December 31, 2020 | $ | 40 |  |  | $ | 23 |  |  | $ | 5 |  |  | $ | 6 |
Contract liabilities at June 30, 2021 | 31 |  |  | 16 |  |  | 5 |  |  | 5 |
Revenue recognized during the six months ended June 30, 2021 that was included in the contract liability balance at December 31, 2020 | 24 |  |  | 11 |  |  | 5 |  |  | 6 |
Contract liabilities at December 31, 2019 | $ | 37 |  |  | $ | 21 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities at June 30, 2020 | 30 |  |  | 16 |  |  | 4 |  |  | 5 |
Revenue recognized during the six months ended June 30, 2020 that was included in the contract liability balance at December 31, 2019 | 21 |  |  | 9 |  |  | 5 |  |  | 4 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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