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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Assets |  |
Cash and cash equivalents | $ 294 | $ 306
Restricted cash and cash equivalents | 24 | 33
Total Cash, Cash Equivalents and Restricted Cash | 318 | 339
Special Use Funds [Abstract] |  |
Money market fund | 1 | 1
Commingled debt fund measured at NAV | 7 | 10
Commingled equity fund measured at NAV | 6 | 8
Total special use funds | 14 | 19
Interest Rate Derivative Assets | 2 | 0
Gas Contracts | 10 | 9
Price risk management assets: |  |
Total Assets | 344 | 367
Price risk management liabilities: |  |
Interest rate derivatives | 5 | 3
Gas Contracts | 8 | 13
Total price risk management liabilities | 13 | 16
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 294 | 306
Restricted cash and cash equivalents | 24 | 33
Total Cash, Cash Equivalents and Restricted Cash | 318 | 339
Special Use Funds [Abstract] |  |
Money market fund | 1 | 1
Total special use funds | 1 | 1
Interest Rate Derivative Assets | 0 | 0
Gas Contracts | 0 | 0
Price risk management assets: |  |
Total Assets | 319 | 340
Price risk management liabilities: |  |
Interest rate derivatives | 0 | 0
Gas Contracts | 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
Interest Rate Derivative Assets | 2 | 0
Gas Contracts | 10 | 4
Price risk management assets: |  |
Total Assets | 12 | 4
Price risk management liabilities: |  |
Interest rate derivatives | 5 | 3
Gas Contracts | 3 | 10
Total price risk management liabilities | 8 | 13
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
Interest Rate Derivative Assets | 0 | 0
Gas Contracts | 0 | 5
Price risk management assets: |  |
Total Assets | 0 | 5
Price risk management liabilities: |  |
Interest rate derivatives | 0 | 0
Gas Contracts | 5 | 3
Total price risk management liabilities | 5 | 3
Level 3 [Member] | Gas Contracts |  |
Price risk management liabilities: |  |
Gas Contracts, Asset (Liability), Balance | (5) | 2
Total unrealized gains (losses) on Regulatory Asset/Regulatory Liability | (7) |
PPL Electric Utilities Corp [Member] |  |
Assets |  |
Cash and cash equivalents | 15 | 24
Price risk management assets: |  |
Total Assets | 15 | 24
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 15 | 24
Price risk management assets: |  |
Total Assets | 15 | 24
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 | 10 | 8
Restricted cash and cash equivalents | 11 | 16
Total Cash, Cash Equivalents and Restricted Cash | 21 | 24
Price risk management assets: |  |
Total Assets | 21 | 24
Price risk management liabilities: |  |
Interest rate derivatives | 5 | 3
Total price risk management liabilities | 5 | 3
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 10 | 8
Restricted cash and cash equivalents | 11 | 16
Total Cash, Cash Equivalents and Restricted Cash | 21 | 24
Price risk management assets: |  |
Total Assets | 21 | 24
Price risk management liabilities: |  |
Interest rate derivatives | 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
Restricted cash and cash equivalents | 0 | 0
Total Cash, Cash Equivalents and Restricted Cash | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate derivatives | 5 | 3
Total price risk management liabilities | 5 | 3
Louisville Gas And Electric Co [Member] | 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
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate derivatives | 0 | 0
Total price risk management liabilities | 0 | 0
Kentucky Utilities Co [Member] |  |
Assets |  |
Cash and cash equivalents | 11 | 13
Restricted cash and cash equivalents | 11 | 16
Total Cash, Cash Equivalents and Restricted Cash | 22 | 29
Price risk management assets: |  |
Total Assets | 22 | 29
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 11 | 13
Restricted cash and cash equivalents | 11 | 16
Total Cash, Cash Equivalents and Restricted Cash | 22 | 29
Price risk management assets: |  |
Total Assets | 22 | 29
Kentucky Utilities Co [Member] | 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
Price risk management assets: |  |
Total Assets | 0 | 0
Kentucky Utilities Co [Member] | 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
Price risk management assets: |  |
Total Assets | $ 0 | $ 0

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