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, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 1,102	$ 306
Restricted cash and cash equivalents	17	33
Total Cash, Cash Equivalents and Restricted Cash	1,119	339
Special Use Funds [Abstract]
Money market fund	2	1
Commingled debt fund measured at NAV	6	10
Commingled equity fund measured at NAV	5	8
Total special use funds	13	19
Gas Contracts	4	9
Price risk management assets:
Total Assets	1,136	367
Price risk management liabilities:
Interest rate derivatives	5	3
Gas Contracts	11	13
Total price risk management liabilities	16	16
Level 1 [Member]
Assets
Cash and cash equivalents	1,102	306
Restricted cash and cash equivalents	17	33
Total Cash, Cash Equivalents and Restricted Cash	1,119	339
Special Use Funds [Abstract]
Money market fund	2	1
Total special use funds	2	1
Gas Contracts	0	0
Price risk management assets:
Total Assets	1,121	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
Gas Contracts	4	4
Price risk management assets:
Total Assets	4	4
Price risk management liabilities:
Interest rate derivatives	5	3
Gas Contracts	7	10
Total price risk management liabilities	12	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
Gas Contracts	0	5
Price risk management assets:
Total Assets	0	5
Price risk management liabilities:
Interest rate derivatives	0	0
Gas Contracts	4	3
Total price risk management liabilities	4	3
Level 3 [Member] | Gas Contracts
Price risk management liabilities:
Gas Contracts, Asset (Liability), Balance	(4)	2
Total unrealized gains (losses) on Regulatory Asset/Regulatory Liability	(6)
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	13	24
Price risk management assets:
Total Assets	13	24
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	13	24
Price risk management assets:
Total Assets	13	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	515	8
Restricted cash and cash equivalents	8	16
Total Cash, Cash Equivalents and Restricted Cash	523	24
Price risk management assets:
Total Assets	523	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	515	8
Restricted cash and cash equivalents	8	16
Total Cash, Cash Equivalents and Restricted Cash	523	24
Price risk management assets:
Total Assets	523	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	341	13
Restricted cash and cash equivalents	8	16
Total Cash, Cash Equivalents and Restricted Cash	349	29
Price risk management assets:
Total Assets	349	29
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	341	13
Restricted cash and cash equivalents	8	16
Total Cash, Cash Equivalents and Restricted Cash	349	29
Price risk management assets:
Total Assets	349	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