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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies [Line Items] |
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following table shows the amounts recorded on the Balance Sheets as of January 1, 2019 as a result of the adoption of the new lease guidance using a modified retrospective transition method with transition applied as of the beginning of the period of adoption:
| PPL |  | LKE |  | LG&E |  | KU
Right-of-Use Asset (a) | $ | 81 |  |  | $ | 56 |  |  | $ | 23 |  |  | $ | 31 |
Lease Liability - Current (b) | 23 |  |  | 18 |  |  | 9 |  |  | 9 |
Lease Liability - Noncurrent (c) | 67 |  |  | 46 |  |  | 18 |  |  | 26 |
(a) | Right-of-Use Assets are recorded in "Other noncurrent assets" on the Balance Sheets.
(b) | Current lease liabilities are recorded in "Other current liabilities" on the Balance Sheets.
(c) Noncurrent lease liabilities are recorded in "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
Schedule of Valuation and Qualifying Accounts Disclosure | The changes in the allowance for doubtful accounts were:
|  |  | Additions |  |  |  |
| Balance at Beginning of Period |  | Charged to Income |  | Charged to Other Accounts |  | Deductions (a) |  | Balance at End of Period
PPL |  |  |  |  |  |  |  |  |
2019 | $ | 56 |  |  | $ | 37 |  |  | $ | 3 |  |  | $ | 38 |  |  | $ | 58 |
2018 | 51 |  |  | 41 |  |  | 3 |  |  | 39 |  |  | 56 |
2017 | 54 |  |  | 28 |  |  | (1 | ) |  | 30 |  |  | 51 |
PPL Electric |  |  |  |  |  |  |  |  |
2019 | $ | 27 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 25 |  |  | $ | 28 |
2018 | 24 |  |  | 29 |  |  | — |  |  | 26 |  |  | 27 |
2017 | 28 |  |  | 18 |  |  | — |  |  | 22 |  |  | 24 |
LKE |  |  |  |  |  |  |  |  |
2019 | $ | 27 |  |  | $ | 8 |  |  | $ | 3 |  |  | $ | 10 |  |  | $ | 28 |
2018 | 25 |  |  | 10 |  |  | 3 |  |  | 11 |  |  | 27 |
2017 | 24 |  |  | 8 |  |  | (1 | ) |  | 6 |  |  | 25 |
LG&E |  |  |  |  |  |  |  |  |
2019 | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 1 |
2018 | 1 |  |  | 4 |  |  | 1 |  |  | 5 |  |  | 1 |
2017 | 2 |  |  | 2 |  |  | (1 | ) |  | 2 |  |  | 1 |
KU |  |  |  |  |  |  |  |  |
2019 | $ | 2 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | 1 |
2018 | 1 |  |  | 5 |  |  | 2 |  |  | 6 |  |  | 2 |
2017 | 2 |  |  | 4 |  |  | (1 | ) |  | 4 |  |  | 1 |
(a) | Primarily related to uncollectible accounts written off.
Weighted-average Rates of Depreciation | Following are the weighted-average annual rates of depreciation, for regulated utility plant, for the years ended December 31:
| 2019 |  | 2018 |  | 2017
PPL | 2.84 | % |  | 2.77 | % |  | 2.65 | %
PPL Electric | 3.05 | % |  | 3.01 | % |  | 2.86 | %
LKE | 3.96 | % |  | 3.69 | % |  | 3.64 | %
LG&E | 3.87 | % |  | 3.63 | % |  | 3.63 | %
KU | 4.02 | % |  | 3.74 | % |  | 3.66 | %
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Fuel | $ | 106 |  |  | $ | 98 |  |  | $ | 106 |  |  | $ | 98 |  |  | $ | 43 |  |  | $ | 42 |  |  | $ | 63 |  |  | $ | 56 |
Natural gas stored underground | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | — |  |  | — |
Materials and supplies | 191 |  |  | 164 |  |  | 109 |  |  | 109 |  |  | 44 |  |  | 44 |  |  | 65 |  |  | 65 |
Total | $ | 332 |  |  | $ | 303 |  |  | $ | 250 |  |  | $ | 248 |  |  | $ | 122 |  |  | $ | 127 |  |  | $ | 128 |  |  | $ | 121 |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow | The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:
| PPL |  | PPL Electric
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 815 |  |  | $ | 621 |  |  | $ | 262 |  |  | $ | 267 |
Restricted cash - current | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Restricted cash - noncurrent (a) | 18 |  |  | 19 |  |  | — |  |  | — |
Total Cash, Cash Equivalents and Restricted Cash | $ | 836 |  |  | $ | 643 |  |  | $ | 264 |  |  | $ | 269 |
(a) Primarily consists of funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.
PPL Electric Utilities Corp [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 19 |
LKE | (8 | ) |  | (16 | )
LG&E | (4 | ) |  | — |
KU | (6 | ) |  | (5 | )
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow | The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:
| PPL |  | PPL Electric
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 815 |  |  | $ | 621 |  |  | $ | 262 |  |  | $ | 267 |
Restricted cash - current | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Restricted cash - noncurrent (a) | 18 |  |  | 19 |  |  | — |  |  | — |
Total Cash, Cash Equivalents and Restricted Cash | $ | 836 |  |  | $ | 643 |  |  | $ | 264 |  |  | $ | 269 |
(a) Primarily consists of funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.
LG And E And KU Energy LLC [Member] |
Summary of Significant Accounting Policies [Line Items] |
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following table shows the amounts recorded on the Balance Sheets as of January 1, 2019 as a result of the adoption of the new lease guidance using a modified retrospective transition method with transition applied as of the beginning of the period of adoption:
| PPL |  | LKE |  | LG&E |  | KU
Right-of-Use Asset (a) | $ | 81 |  |  | $ | 56 |  |  | $ | 23 |  |  | $ | 31 |
Lease Liability - Current (b) | 23 |  |  | 18 |  |  | 9 |  |  | 9 |
Lease Liability - Noncurrent (c) | 67 |  |  | 46 |  |  | 18 |  |  | 26 |
(a) | Right-of-Use Assets are recorded in "Other noncurrent assets" on the Balance Sheets.
(b) | Current lease liabilities are recorded in "Other current liabilities" on the Balance Sheets.
(c) Noncurrent lease liabilities are recorded in "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 19 |
LKE | (8 | ) |  | (16 | )
LG&E | (4 | ) |  | — |
KU | (6 | ) |  | (5 | )
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Fuel | $ | 106 |  |  | $ | 98 |  |  | $ | 106 |  |  | $ | 98 |  |  | $ | 43 |  |  | $ | 42 |  |  | $ | 63 |  |  | $ | 56 |
Natural gas stored underground | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | — |  |  | — |
Materials and supplies | 191 |  |  | 164 |  |  | 109 |  |  | 109 |  |  | 44 |  |  | 44 |  |  | 65 |  |  | 65 |
Total | $ | 332 |  |  | $ | 303 |  |  | $ | 250 |  |  | $ | 248 |  |  | $ | 122 |  |  | $ | 127 |  |  | $ | 128 |  |  | $ | 121 |
Louisville Gas And Electric Co [Member] |
Summary of Significant Accounting Policies [Line Items] |
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following table shows the amounts recorded on the Balance Sheets as of January 1, 2019 as a result of the adoption of the new lease guidance using a modified retrospective transition method with transition applied as of the beginning of the period of adoption:
| PPL |  | LKE |  | LG&E |  | KU
Right-of-Use Asset (a) | $ | 81 |  |  | $ | 56 |  |  | $ | 23 |  |  | $ | 31 |
Lease Liability - Current (b) | 23 |  |  | 18 |  |  | 9 |  |  | 9 |
Lease Liability - Noncurrent (c) | 67 |  |  | 46 |  |  | 18 |  |  | 26 |
(a) | Right-of-Use Assets are recorded in "Other noncurrent assets" on the Balance Sheets.
(b) | Current lease liabilities are recorded in "Other current liabilities" on the Balance Sheets.
(c) Noncurrent lease liabilities are recorded in "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 19 |
LKE | (8 | ) |  | (16 | )
LG&E | (4 | ) |  | — |
KU | (6 | ) |  | (5 | )
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Fuel | $ | 106 |  |  | $ | 98 |  |  | $ | 106 |  |  | $ | 98 |  |  | $ | 43 |  |  | $ | 42 |  |  | $ | 63 |  |  | $ | 56 |
Natural gas stored underground | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | — |  |  | — |
Materials and supplies | 191 |  |  | 164 |  |  | 109 |  |  | 109 |  |  | 44 |  |  | 44 |  |  | 65 |  |  | 65 |
Total | $ | 332 |  |  | $ | 303 |  |  | $ | 250 |  |  | $ | 248 |  |  | $ | 122 |  |  | $ | 127 |  |  | $ | 128 |  |  | $ | 121 |
Kentucky Utilities Co [Member] |
Summary of Significant Accounting Policies [Line Items] |
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following table shows the amounts recorded on the Balance Sheets as of January 1, 2019 as a result of the adoption of the new lease guidance using a modified retrospective transition method with transition applied as of the beginning of the period of adoption:
| PPL |  | LKE |  | LG&E |  | KU
Right-of-Use Asset (a) | $ | 81 |  |  | $ | 56 |  |  | $ | 23 |  |  | $ | 31 |
Lease Liability - Current (b) | 23 |  |  | 18 |  |  | 9 |  |  | 9 |
Lease Liability - Noncurrent (c) | 67 |  |  | 46 |  |  | 18 |  |  | 26 |
(a) | Right-of-Use Assets are recorded in "Other noncurrent assets" on the Balance Sheets.
(b) | Current lease liabilities are recorded in "Other current liabilities" on the Balance Sheets.
(c) Noncurrent lease liabilities are recorded in "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 19 |
LKE | (8 | ) |  | (16 | )
LG&E | (4 | ) |  | — |
KU | (6 | ) |  | (5 | )
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Fuel | $ | 106 |  |  | $ | 98 |  |  | $ | 106 |  |  | $ | 98 |  |  | $ | 43 |  |  | $ | 42 |  |  | $ | 63 |  |  | $ | 56 |
Natural gas stored underground | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | 35 |  |  | 41 |  |  | — |  |  | — |
Materials and supplies | 191 |  |  | 164 |  |  | 109 |  |  | 109 |  |  | 44 |  |  | 44 |  |  | 65 |  |  | 65 |
Total | $ | 332 |  |  | $ | 303 |  |  | $ | 250 |  |  | $ | 248 |  |  | $ | 122 |  |  | $ | 127 |  |  | $ | 128 |  |  | $ | 121 |

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