v3.25.2
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