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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items] |
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 to the amounts shown on the Statements of Cash Flows:
| December 31, 2021 |  | December 31, 2020 |  |  |  |
Cash and cash equivalents | $ | 3,571 |  |  | $ | 442 |  |  |  |  |
Restricted cash - current | 1 |  |  | 1 |  |  |  |  |
Total Cash, Cash Equivalents and Restricted Cash | $ | 3,572 |  |  | $ | 443 |  |  |  |  |
Capitalized Interest Table Text Block | Capitalized interest, including the debt component of AFUDC, for the years ended December 31 is as follows:
| 2021 |  | 2020 |  | 2019
PPL | $ | 6 |  |  | $ | 7 |  |  | $ | 9 |
PPL Electric | 6 |  |  | 7 |  |  | 8 |
Weighted-average Rates of Depreciation | Following are the weighted-average annual rates of depreciation, for regulated utility plant, for the years ended December 31:
| 2021 |  | 2020 |  | 2019
PPL | 3.61 | % |  | 3.53 | % |  | 3.54 | %
PPL Electric | 3.05 | % |  | 2.99 | % |  | 3.05 | %
LG&E | 3.99 | % |  | 4.00 | % |  | 3.87 | %
KU | 4.17 | % |  | 4.00 | % |  | 4.02 | %
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| 2021
| PPL |  | PPL Electric |  | LG&E |  | KU
Fuel | $ | 90 |  |  | $ | — |  |  | $ | 32 |  |  | $ | 58 |
Natural gas stored underground | 54 |  |  | — |  |  | 54 |  |  | — |
Materials and supplies | 178 |  |  | 61 |  |  | 51 |  |  | 66 |
Total | $ | 322 |  |  | $ | 61 |  |  | $ | 137 |  |  | $ | 124 |
| 2020
| PPL |  | PPL Electric |  | LG&E |  | KU
Fuel | $ | 95 |  |  | $ | — |  |  | $ | 38 |  |  | $ | 57 |
Natural gas stored underground | 30 |  |  | — |  |  | 30 |  |  | — |
Materials and supplies | 177 |  |  | 59 |  |  | 51 |  |  | 66 |
Total | $ | 302 |  |  | $ | 59 |  |  | $ | 119 |  |  | $ | 123 |
Schedule of Valuation and Qualifying Accounts Disclosure | The changes in the allowance for doubtful accounts are included in the following table. Amounts relate to financing receivables, except as noted.
|  |  | Additions |  |  |  |  |
| Balance at Beginning of Period |  | Charged to Income |  | Charged to Other Accounts |  | Deductions (b) |  | Balance at End of Period |
PPL |  |  |  |  |  |  |  |  |  |
2021 | $ | 73 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 69 |  | (d)
2020 (a) | 58 |  | (a) | 28 |  |  | — |  |  | 13 |  |  | 73 |  | (d)
2019 | 54 |  |  | 34 |  |  | 3 |  |  | 35 |  |  | 56 |  |
PPL Electric |  |  |  |  |  |  |  |  |  |
2021 | $ | 41 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 19 |  |  | $ | 35 |  | (c)
2020 | 30 |  | (a) | 19 |  |  | — |  |  | 8 |  |  | 41 |  | (c)
2019 | 27 |  |  | 26 |  |  | — |  |  | 25 |  |  | 28 |  |
LG&E |  |  |  |  |  |  |  |  |  |
2021 | $ | 3 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 3 |  |
2020 | 1 |  |  | 4 |  |  | — |  |  | 2 |  |  | 3 |  |
2019 | 1 |  |  | 2 |  |  | 2 |  |  | 4 |  |  | 1 |  |
KU |  |  |  |  |  |  |  |  |  |
2021 | $ | 2 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 7 |  |  | $ | 3 |  |
2020 | 1 |  |  | 4 |  |  | — |  |  | 3 |  |  | 2 |  |
2019 | 2 |  |  | 4 |  |  | 1 |  |  | 6 |  |  | 1 |  |
(a)Adjusted for $2 million cumulative-effect adjustment upon adoption of current expected credit loss guidance. (b)Primarily related to uncollectible accounts written off. (c)Includes $3 million related to other accounts receivables at December 31, 2021 and 2020. (d)Includes $32 million and $30 million related to other accounts receivables at December 31, 2021 and 2020.
PPL Electric Utilities Corp [Member] |
Summary of Significant Accounting Policies [Line Items] |
Capitalized Interest Table Text Block | Capitalized interest, including the debt component of AFUDC, for the years ended December 31 is as follows:
| 2021 |  | 2020 |  | 2019
PPL | $ | 6 |  |  | $ | 7 |  |  | $ | 9 |
PPL Electric | 6 |  |  | 7 |  |  | 8 |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2021 |  | 2020
PPL Electric | $ | (4) |  |  | $ | (9) |
LG&E | 4 |  |  | (1) |
KU | 1 |  |  | (5) |
Louisville Gas And Electric Co [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2021 |  | 2020
PPL Electric | $ | (4) |  |  | $ | (9) |
LG&E | 4 |  |  | (1) |
KU | 1 |  |  | (5) |
Kentucky Utilities Co [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2021 |  | 2020
PPL Electric | $ | (4) |  |  | $ | (9) |
LG&E | 4 |  |  | (1) |
KU | 1 |  |  | (5) |

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