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, 2024	Dec. 31, 2023
Assets
Cash and cash equivalents	$ 282	$ 331
Restricted cash and cash equivalents	42	51
Total Cash, Cash Equivalents and Restricted Cash	324	382
Special Use Funds [Abstract]
Money market fund	1	1
Commingled debt fund measured at NAV	6	9
Commingled equity fund measured at NAV	5	8
Total special use funds	12	18
Gas Contracts	2	1
Price risk management assets:
Total Assets	338	401
Price risk management liabilities:
Interest rate swaps	4	7
Gas Contracts	22	60
Total price risk management liabilities	26	67
Level 1 [Member]
Assets
Cash and cash equivalents	282	331
Restricted cash and cash equivalents	42	51
Total Cash, Cash Equivalents and Restricted Cash	324	382
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	325	383
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	0	1
Price risk management assets:
Total Assets	0	1
Price risk management liabilities:
Interest rate swaps	4	7
Gas Contracts	22	41
Total price risk management liabilities	26	48
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	2	0
Price risk management assets:
Total Assets	2	0
Price risk management liabilities:
Interest rate swaps	0	0
Gas Contracts	0	19
Total price risk management liabilities	0	19
Level 3 [Member] | Gas Contracts
Price risk management liabilities:
Gas Contracts, Liability, Settlements	19
Gas Contracts, Asset, Purchases	2
Gas Contracts, Asset (Liability), Balance	2	(19)
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	13	51
Price risk management assets:
Total Assets	13	51
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	13	51
Price risk management assets:
Total Assets	13	51
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	8	18
Restricted cash and cash equivalents	20	26
Total Cash, Cash Equivalents and Restricted Cash	28	44
Price risk management assets:
Total Assets	28	44
Price risk management liabilities:
Interest rate swaps	4	7
Total price risk management liabilities	4	7
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8	18
Restricted cash and cash equivalents	20	26
Total Cash, Cash Equivalents and Restricted Cash	28	44
Price risk management assets:
Total Assets	28	44
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	4	7
Total price risk management liabilities	4	7
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	11	14
Restricted cash and cash equivalents	20	24
Total Cash, Cash Equivalents and Restricted Cash	31	38
Price risk management assets:
Total Assets	31	38
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	11	14
Restricted cash and cash equivalents	20	24
Total Cash, Cash Equivalents and Restricted Cash	31	38
Price risk management assets:
Total Assets	31	38
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