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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Line Items] |
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] | PPL, LKE, LG&E and KU expect to receive over the remaining term of their operating lease agreements for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 11 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 5 |
2022 | 6 |  |  | — |  |  | — |  |  | — |
2023 | 6 |  |  | 1 |  |  | — |  |  | — |
2024 | 5 |  |  | — |  |  | — |  |  | — |
2025 | 4 |  |  | — |  |  | — |  |  | — |
Thereafter | 12 |  |  | — |  |  | — |  |  | — |
Total | $ | 44 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 5 |
Lease income recognized for the twelve months ended December 31, 2020 | $ | 21 |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 9 |
Lease income recognized for the twelve months ended December 31, 2019 | 21 |  |  | 13 |  |  | 5 |  |  | 8 |
Lease, Cost [Table Text Block] | The following table provides the components of lease cost for the Registrants' operating leases for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 30 |  |  | $ | 22 |  |  | $ | 8 |  |  | $ | 13 |
Short-term lease cost | 9 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 39 |  |  | $ | 24 |  |  | $ | 9 |  |  | $ | 14 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 33 |  |  | $ | 25 |  |  | $ | 12 |  |  | $ | 13 |
Short-term lease cost | 7 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 40 |  |  | $ | 27 |  |  | $ | 13 |  |  | $ | 14 |
The following table provides other key information related to the Registrants' operating leases at December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 26 |  |  | $ | 18 |  |  | $ | 7 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 17 |  |  | 16 |  |  | 6 |  |  | 9 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 29 |  |  | $ | 21 |  |  | $ | 9 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 46 |  |  | 16 |  |  | 5 |  |  | 11 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table provides the total future minimum rental payments for operating leases, as well as a reconciliation of these undiscounted cash flows to the lease liabilities recognized on the Balance Sheets as of December 31, 2020.
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 27 |  | $ | 17 |  | $ | 6 |  | $ | 10
2022 | 22 |  | 13 |  | 5 |  | 8
2023 | 18 |  | 10 |  | 4 |  | 6
2024 | 15 |  | 8 |  | 3 |  | 4
2025 | 8 |  | 6 |  | 3 |  | 3
Thereafter | 20 |  | 3 |  | 1 |  | 2
Total | $ | 110 |  | $ | 57 |  | $ | 22 |  | $ | 33
Weighted-average discount rate | 3.35% |  | 3.66% |  | 3.53% |  | 3.68%
Weighted-average remaining lease term (in years) | 8 |  | 4 |  | 4 |  | 4
Current lease liabilities (a) | $ | 24 |  | $ | 16 |  | $ | 6 |  | $ | 9
Non-current lease liabilities (a) | 70 |  | 37 |  | 15 |  | 21
Right-of-use assets (b) | 87 |  | 46 |  | 17 |  | 27
(a) Current lease liabilities are included in "Other Current Liabilities" on the Balance Sheets. Non-current lease liabilities are included in "Other deferred credits and noncurrent liabilities" on the Balance Sheets. The difference between the total future minimum lease payments and the recorded lease liabilities is due to the impact of discounting. (b) Right-of-use assets are included in "Other noncurrent assets" on the Balance Sheets.
LG And E And KU Energy LLC [Member] |
Leases [Line Items] |
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] | PPL, LKE, LG&E and KU expect to receive over the remaining term of their operating lease agreements for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 11 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 5 |
2022 | 6 |  |  | — |  |  | — |  |  | — |
2023 | 6 |  |  | 1 |  |  | — |  |  | — |
2024 | 5 |  |  | — |  |  | — |  |  | — |
2025 | 4 |  |  | — |  |  | — |  |  | — |
Thereafter | 12 |  |  | — |  |  | — |  |  | — |
Total | $ | 44 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 5 |
Lease income recognized for the twelve months ended December 31, 2020 | $ | 21 |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 9 |
Lease income recognized for the twelve months ended December 31, 2019 | 21 |  |  | 13 |  |  | 5 |  |  | 8 |
Lease, Cost [Table Text Block] | The following table provides the components of lease cost for the Registrants' operating leases for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 30 |  |  | $ | 22 |  |  | $ | 8 |  |  | $ | 13 |
Short-term lease cost | 9 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 39 |  |  | $ | 24 |  |  | $ | 9 |  |  | $ | 14 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 33 |  |  | $ | 25 |  |  | $ | 12 |  |  | $ | 13 |
Short-term lease cost | 7 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 40 |  |  | $ | 27 |  |  | $ | 13 |  |  | $ | 14 |
The following table provides other key information related to the Registrants' operating leases at December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 26 |  |  | $ | 18 |  |  | $ | 7 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 17 |  |  | 16 |  |  | 6 |  |  | 9 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 29 |  |  | $ | 21 |  |  | $ | 9 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 46 |  |  | 16 |  |  | 5 |  |  | 11 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table provides the total future minimum rental payments for operating leases, as well as a reconciliation of these undiscounted cash flows to the lease liabilities recognized on the Balance Sheets as of December 31, 2020.
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 27 |  | $ | 17 |  | $ | 6 |  | $ | 10
2022 | 22 |  | 13 |  | 5 |  | 8
2023 | 18 |  | 10 |  | 4 |  | 6
2024 | 15 |  | 8 |  | 3 |  | 4
2025 | 8 |  | 6 |  | 3 |  | 3
Thereafter | 20 |  | 3 |  | 1 |  | 2
Total | $ | 110 |  | $ | 57 |  | $ | 22 |  | $ | 33
Weighted-average discount rate | 3.35% |  | 3.66% |  | 3.53% |  | 3.68%
Weighted-average remaining lease term (in years) | 8 |  | 4 |  | 4 |  | 4
Current lease liabilities (a) | $ | 24 |  | $ | 16 |  | $ | 6 |  | $ | 9
Non-current lease liabilities (a) | 70 |  | 37 |  | 15 |  | 21
Right-of-use assets (b) | 87 |  | 46 |  | 17 |  | 27
(a) Current lease liabilities are included in "Other Current Liabilities" on the Balance Sheets. Non-current lease liabilities are included in "Other deferred credits and noncurrent liabilities" on the Balance Sheets. The difference between the total future minimum lease payments and the recorded lease liabilities is due to the impact of discounting. (b) Right-of-use assets are included in "Other noncurrent assets" on the Balance Sheets.
Louisville Gas And Electric Co [Member] |
Leases [Line Items] |
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] | PPL, LKE, LG&E and KU expect to receive over the remaining term of their operating lease agreements for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 11 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 5 |
2022 | 6 |  |  | — |  |  | — |  |  | — |
2023 | 6 |  |  | 1 |  |  | — |  |  | — |
2024 | 5 |  |  | — |  |  | — |  |  | — |
2025 | 4 |  |  | — |  |  | — |  |  | — |
Thereafter | 12 |  |  | — |  |  | — |  |  | — |
Total | $ | 44 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 5 |
Lease income recognized for the twelve months ended December 31, 2020 | $ | 21 |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 9 |
Lease income recognized for the twelve months ended December 31, 2019 | 21 |  |  | 13 |  |  | 5 |  |  | 8 |
Lease, Cost [Table Text Block] | The following table provides the components of lease cost for the Registrants' operating leases for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 30 |  |  | $ | 22 |  |  | $ | 8 |  |  | $ | 13 |
Short-term lease cost | 9 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 39 |  |  | $ | 24 |  |  | $ | 9 |  |  | $ | 14 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 33 |  |  | $ | 25 |  |  | $ | 12 |  |  | $ | 13 |
Short-term lease cost | 7 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 40 |  |  | $ | 27 |  |  | $ | 13 |  |  | $ | 14 |
The following table provides other key information related to the Registrants' operating leases at December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 26 |  |  | $ | 18 |  |  | $ | 7 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 17 |  |  | 16 |  |  | 6 |  |  | 9 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 29 |  |  | $ | 21 |  |  | $ | 9 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 46 |  |  | 16 |  |  | 5 |  |  | 11 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table provides the total future minimum rental payments for operating leases, as well as a reconciliation of these undiscounted cash flows to the lease liabilities recognized on the Balance Sheets as of December 31, 2020.
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 27 |  | $ | 17 |  | $ | 6 |  | $ | 10
2022 | 22 |  | 13 |  | 5 |  | 8
2023 | 18 |  | 10 |  | 4 |  | 6
2024 | 15 |  | 8 |  | 3 |  | 4
2025 | 8 |  | 6 |  | 3 |  | 3
Thereafter | 20 |  | 3 |  | 1 |  | 2
Total | $ | 110 |  | $ | 57 |  | $ | 22 |  | $ | 33
Weighted-average discount rate | 3.35% |  | 3.66% |  | 3.53% |  | 3.68%
Weighted-average remaining lease term (in years) | 8 |  | 4 |  | 4 |  | 4
Current lease liabilities (a) | $ | 24 |  | $ | 16 |  | $ | 6 |  | $ | 9
Non-current lease liabilities (a) | 70 |  | 37 |  | 15 |  | 21
Right-of-use assets (b) | 87 |  | 46 |  | 17 |  | 27
(a) Current lease liabilities are included in "Other Current Liabilities" on the Balance Sheets. Non-current lease liabilities are included in "Other deferred credits and noncurrent liabilities" on the Balance Sheets. The difference between the total future minimum lease payments and the recorded lease liabilities is due to the impact of discounting. (b) Right-of-use assets are included in "Other noncurrent assets" on the Balance Sheets.
Kentucky Utilities Co [Member] |
Leases [Line Items] |
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] | PPL, LKE, LG&E and KU expect to receive over the remaining term of their operating lease agreements for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 11 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 5 |
2022 | 6 |  |  | — |  |  | — |  |  | — |
2023 | 6 |  |  | 1 |  |  | — |  |  | — |
2024 | 5 |  |  | — |  |  | — |  |  | — |
2025 | 4 |  |  | — |  |  | — |  |  | — |
Thereafter | 12 |  |  | — |  |  | — |  |  | — |
Total | $ | 44 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 5 |
Lease income recognized for the twelve months ended December 31, 2020 | $ | 21 |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 9 |
Lease income recognized for the twelve months ended December 31, 2019 | 21 |  |  | 13 |  |  | 5 |  |  | 8 |
Lease, Cost [Table Text Block] | The following table provides the components of lease cost for the Registrants' operating leases for the years ended December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 30 |  |  | $ | 22 |  |  | $ | 8 |  |  | $ | 13 |
Short-term lease cost | 9 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 39 |  |  | $ | 24 |  |  | $ | 9 |  |  | $ | 14 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Lease cost: |  |  |  |  |  |  |
Operating lease cost | $ | 33 |  |  | $ | 25 |  |  | $ | 12 |  |  | $ | 13 |
Short-term lease cost | 7 |  |  | 2 |  |  | 1 |  |  | 1 |
Total lease cost | $ | 40 |  |  | $ | 27 |  |  | $ | 13 |  |  | $ | 14 |
The following table provides other key information related to the Registrants' operating leases at December 31:
| 2020
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 26 |  |  | $ | 18 |  |  | $ | 7 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 17 |  |  | 16 |  |  | 6 |  |  | 9 |
| 2019
| PPL |  | LKE |  | LG&E |  | KU
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows from operating leases | $ | 29 |  |  | $ | 21 |  |  | $ | 9 |  |  | $ | 11 |
Right-of-use asset obtained in exchange for new operating lease liabilities | 46 |  |  | 16 |  |  | 5 |  |  | 11 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table provides the total future minimum rental payments for operating leases, as well as a reconciliation of these undiscounted cash flows to the lease liabilities recognized on the Balance Sheets as of December 31, 2020.
| PPL |  | LKE |  | LG&E |  | KU
2021 | $ | 27 |  | $ | 17 |  | $ | 6 |  | $ | 10
2022 | 22 |  | 13 |  | 5 |  | 8
2023 | 18 |  | 10 |  | 4 |  | 6
2024 | 15 |  | 8 |  | 3 |  | 4
2025 | 8 |  | 6 |  | 3 |  | 3
Thereafter | 20 |  | 3 |  | 1 |  | 2
Total | $ | 110 |  | $ | 57 |  | $ | 22 |  | $ | 33
Weighted-average discount rate | 3.35% |  | 3.66% |  | 3.53% |  | 3.68%
Weighted-average remaining lease term (in years) | 8 |  | 4 |  | 4 |  | 4
Current lease liabilities (a) | $ | 24 |  | $ | 16 |  | $ | 6 |  | $ | 9
Non-current lease liabilities (a) | 70 |  | 37 |  | 15 |  | 21
Right-of-use assets (b) | 87 |  | 46 |  | 17 |  | 27
(a) Current lease liabilities are included in "Other Current Liabilities" on the Balance Sheets. Non-current lease liabilities are included in "Other deferred credits and noncurrent liabilities" on the Balance Sheets. The difference between the total future minimum lease payments and the recorded lease liabilities is due to the impact of discounting. (b) Right-of-use assets are included in "Other noncurrent assets" on the Balance Sheets.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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