v3.26.3
Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Assets    
Cash and cash equivalents $ 393 $ 1,071
Restricted cash and cash equivalents 3 15
Total Cash, Cash Equivalents and Restricted Cash 396 1,086
Special Use Funds [Abstract]    
Money market fund 0 1
Commingled debt fund measured at NAV 2 5
Commingled equity fund measured at NAV 1 5
Total special use funds 3 11
Gas Contracts 3 6
Price risk management assets:    
Total Assets 402 1,103
Price risk management liabilities:    
Interest rate derivatives 1 5
Gas Contracts 21 10
Total price risk management liabilities 22 15
Level 1 [Member]    
Assets    
Cash and cash equivalents 393 1,071
Restricted cash and cash equivalents 3 15
Total Cash, Cash Equivalents and Restricted Cash 396 1,086
Special Use Funds [Abstract]    
Money market fund 0 1
Total special use funds 0 1
Gas Contracts 0 0
Price risk management assets:    
Total Assets 396 1,087
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
Gas Contracts 0 2
Price risk management assets:    
Total Assets 0 2
Price risk management liabilities:    
Interest rate derivatives 1 5
Gas Contracts 19 6
Total price risk management liabilities 20 11
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
Gas Contracts 3 4
Price risk management assets:    
Total Assets 3 4
Price risk management liabilities:    
Interest rate derivatives 0 0
Gas Contracts 2 4
Total price risk management liabilities 2 4
Level 3 [Member] | Gas Contracts    
Price risk management liabilities:    
Gas Contracts, Asset (Liability), Balance 1 0
Total unrealized gains (losses) on Regulatory Asset/Regulatory Liability 1  
PPL Electric Utilities Corp [Member]    
Assets    
Cash and cash equivalents 9 30
Price risk management assets:    
Total Assets 9 30
PPL Electric Utilities Corp [Member] | Level 1 [Member]    
Assets    
Cash and cash equivalents 9 30
Price risk management assets:    
Total Assets 9 30
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 13 162
Restricted cash and cash equivalents 1 7
Total Cash, Cash Equivalents and Restricted Cash 14 169
Price risk management assets:    
Total Assets 14 169
Price risk management liabilities:    
Interest rate derivatives 1 5
Total price risk management liabilities 1 5
Louisville Gas And Electric Co [Member] | Level 1 [Member]    
Assets    
Cash and cash equivalents 13 162
Restricted cash and cash equivalents 1 7
Total Cash, Cash Equivalents and Restricted Cash 14 169
Price risk management assets:    
Total Assets 14 169
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 1 5
Total price risk management liabilities 1 5
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 23 10
Restricted cash and cash equivalents 1 7
Total Cash, Cash Equivalents and Restricted Cash 24 17
Price risk management assets:    
Total Assets 24 17
Kentucky Utilities Co [Member] | Level 1 [Member]    
Assets    
Cash and cash equivalents 23 10
Restricted cash and cash equivalents 1 7
Total Cash, Cash Equivalents and Restricted Cash 24 17
Price risk management assets:    
Total Assets 24 17
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