Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 312	$ 306
Restricted cash and cash equivalents	28	33
Total Cash, Cash Equivalents and Restricted Cash	340	339
Special Use Funds [Abstract]
Money market fund	1	1
Commingled debt fund measured at NAV	8	10
Commingled equity fund measured at NAV	7	8
Total special use funds	16	19
Gas Contracts	22	9
Price risk management assets:
Total Assets	378	367
Price risk management liabilities:
Interest rate swaps	5	3
Gas Contracts	6	13
Total price risk management liabilities	11	16
Level 1 [Member]
Assets
Cash and cash equivalents	312	306
Restricted cash and cash equivalents	28	33
Total Cash, Cash Equivalents and Restricted Cash	340	339
Special Use Funds [Abstract]
Money market fund	1	1
Total special use funds	1	1
Gas Contracts	0	0
Price risk management assets:
Total Assets	341	340
Price risk management liabilities:
Interest rate swaps	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	22	4
Price risk management assets:
Total Assets	22	4
Price risk management liabilities:
Interest rate swaps	5	3
Gas Contracts	0	10
Total price risk management liabilities	5	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 swaps	0	0
Gas Contracts	6	3
Total price risk management liabilities	6	3
Level 3 [Member] | Gas Contracts
Price risk management liabilities:
Gas Contracts, Liability, Settlements	0
Gas Contracts, Asset (Liability), Balance	6	(2)
Total unrealized gains (losses) on Regulatory Asset/Regulatory Liability	8
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	27	24
Price risk management assets:
Total Assets	27	24
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	27	24
Price risk management assets:
Total Assets	27	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	13	16
Total Cash, Cash Equivalents and Restricted Cash	23	24
Price risk management assets:
Total Assets	23	24
Price risk management liabilities:
Interest rate swaps	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	13	16
Total Cash, Cash Equivalents and Restricted Cash	23	24
Price risk management assets:
Total Assets	23	24
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
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 swaps	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 swaps	0	0
Total price risk management liabilities	0	0
Kentucky Utilities Co [Member]
Assets
Cash and cash equivalents	14	13
Restricted cash and cash equivalents	13	16
Total Cash, Cash Equivalents and Restricted Cash	27	29
Price risk management assets:
Total Assets	27	29
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	14	13
Restricted cash and cash equivalents	13	16
Total Cash, Cash Equivalents and Restricted Cash	27	29
Price risk management assets:
Total Assets	27	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