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Leases Leases - Lessor (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | $ 11
2021 |  |  |  |  |  |  | $ 6 |
2022 |  |  |  |  |  | $ 6 |  |
2023 |  |  |  |  | $ 5 |  |  |
2024 |  |  |  | $ 4 |  |  |  |
Thereafter |  |  | $ 12 |  |  |  |  |
Total | $ 44 |  |  |  |  |  |  |
Lease income recognized | 21 | $ 21 |  |  |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | 5
2021 |  |  |  |  |  |  | 0 |
2022 |  |  |  |  |  | 1 |  |
2023 |  |  |  |  | 0 |  |  |
2024 |  |  |  | 0 |  |  |  |
Thereafter |  |  | 0 |  |  |  |  |
Total | 6 |  |  |  |  |  |  |
Lease income recognized | 15 | 13 |  |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | 0
2021 |  |  |  |  |  |  | 0 |
2022 |  |  |  |  |  | 0 |  |
2023 |  |  |  |  | 0 |  |  |
2024 |  |  |  | 0 |  |  |  |
Thereafter |  |  | 0 |  |  |  |  |
Total | 0 |  |  |  |  |  |  |
Lease income recognized | 6 | 5 |  |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  | $ 5
2021 |  |  |  |  |  |  | $ 0 |
2022 |  |  |  |  |  | $ 0 |  |
2023 |  |  |  |  | $ 0 |  |  |
2024 |  |  |  | $ 0 |  |  |  |
Thereafter |  |  | $ 0 |  |  |  |  |
Total | 5 |  |  |  |  |  |  |
Lease income recognized | $ 9 | $ 8 |  |  |  |  |  |

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- Definition Amount of lease payments to be received by lessor for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of lease payment to be received by lessor for operating lease in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of lease payment to be received by lessor for operating lease in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121561866&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=121640914&loc=SL77927221-108306 + Details
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