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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill | $ 716 | $ 716 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |
Cash and cash equivalents | 4,249 | 3,571 |  |
Restricted Cash, Current | 1 | 1 |  |
Cash, Cash Equivalents and Restricted Cash | 4,250 | 3,572 | $ 422 | $ 443
Cash, Cash Equivalents and Restricted Cash |  | 3,572 |  |
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |
Cash and cash equivalents | 46 | 21 |  |
Cash, Cash Equivalents and Restricted Cash | 46 | 21 | 29 | 40
Louisville Gas And Electric Co [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill | 389 | 389 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |
Cash and cash equivalents | 9 | 9 | 7 | 7
Kentucky Utilities Co [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill | 607 | 607 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |
Cash and cash equivalents | $ 8 | $ 13 | $ 8 | $ 22

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