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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 4,249 | $ 3,571
Restricted cash and cash equivalents | 1 | 1
Total Cash, Cash Equivalents and Restricted Cash | 4,250 | 3,572
Special Use Funds [Abstract] |  |
Money market fund | 1 | 2
Commingled debt fund measured at NAV | 20 | 22
Commingled equity fund measured at NAV | 19 | 21
Total special use funds | 40 | 45
Price risk management assets: |  |
Total Assets | 4,290 | 3,617
Price risk management liabilities: |  |
Interest rate swaps | 14 | 18
Total price risk management liabilities | 14 | 18
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 4,249 | 3,571
Restricted cash and cash equivalents | 1 | 1
Total Cash, Cash Equivalents and Restricted Cash | 4,250 | 3,572
Special Use Funds [Abstract] |  |
Money market fund | 1 | 2
Total special use funds | 1 | 2
Price risk management assets: |  |
Total Assets | 4,251 | 3,574
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
Total Cash, Cash Equivalents and Restricted Cash | 0 | 0
Special Use Funds [Abstract] |  |
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 | 14 | 18
Total price risk management liabilities | 14 | 18
Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Total Cash, Cash Equivalents and Restricted Cash | 0 | 0
Special Use Funds [Abstract] |  |
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 | 46 | 21
Price risk management assets: |  |
Total Assets | 46 | 21
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 46 | 21
Price risk management assets: |  |
Total Assets | 46 | 21
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 | 9
Price risk management assets: |  |
Total Assets | 9 | 9
Price risk management liabilities: |  |
Interest rate swaps | 14 | 18
Total price risk management liabilities | 14 | 18
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 9 | 9
Price risk management assets: |  |
Total Assets | 9 | 9
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 | 14 | 18
Total price risk management liabilities | 14 | 18
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 | 8 | 13
Price risk management assets: |  |
Total Assets | 8 | 13
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 8 | 13
Price risk management assets: |  |
Total Assets | 8 | 13
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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