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Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 3,571 | $ 442
Restricted cash and cash equivalents | 1 | 1
Money market fund | 2 | 0
Commingled debt fund measured at NAV | 22 | 26
Commingled equity fund measured at NAV | 21 | 25
Total special use funds | 45 | 51
Price risk management assets: |  |
Total Assets | 3,617 | 494
Price risk management liabilities: |  |
Interest rate swaps | 18 | 23
Total price risk management liabilities | 18 | 23
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 3,571 | 442
Restricted cash and cash equivalents | 1 | 1
Money market fund | 2 | 0
Total special use funds | 2 | 0
Price risk management assets: |  |
Total Assets | 3,574 | 443
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Total price risk management liabilities | 0 | 0
Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Money market fund | 0 | 0
Total special use funds | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 18 | 23
Total price risk management liabilities | 18 | 23
Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Money market fund | 0 | 0
Total special use funds | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Total price risk management liabilities | 0 | 0
PPL Electric Utilities Corp [Member] |  |
Assets |  |
Cash and cash equivalents | 21 | 40
Price risk management assets: |  |
Total Assets | 21 | 40
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 21 | 40
Price risk management assets: |  |
Total Assets | 21 | 40
PPL Electric Utilities Corp [Member] | Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
PPL Electric Utilities Corp [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Assets |  |
Cash and cash equivalents | 9 | 7
Price risk management assets: |  |
Total Assets | 9 | 7
Price risk management liabilities: |  |
Interest rate swaps | 18 | 23
Total price risk management liabilities | 18 | 23
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 9 | 7
Price risk management assets: |  |
Total Assets | 9 | 7
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Total price risk management liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 18 | 23
Total price risk management liabilities | 18 | 23
Louisville Gas And Electric Co [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Total price risk management liabilities | 0 | 0
Kentucky Utilities Co [Member] |  |
Assets |  |
Cash and cash equivalents | 13 | 22
Price risk management assets: |  |
Total Assets | 13 | 22
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 13 | 22
Price risk management assets: |  |
Total Assets | 13 | 22
Kentucky Utilities Co [Member] | Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Kentucky Utilities Co [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | $ 0 | $ 0

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