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, 2024	Dec. 31, 2023
Assets
Cash and cash equivalents	$ 276	$ 331
Restricted cash and cash equivalents	45	51
Total Cash, Cash Equivalents and Restricted Cash	321	382
Special Use Funds [Abstract]
Money market fund	2	1
Commingled debt fund measured at NAV	7	9
Commingled equity fund measured at NAV	7	8
Total special use funds	16	18
Gas Contracts	1	1
Price risk management assets:
Total Assets	338	401
Price risk management liabilities:
Interest rate swaps	5	7
Gas Contracts	34	60
Total price risk management liabilities	39	67
Level 1 [Member]
Assets
Cash and cash equivalents	276	331
Restricted cash and cash equivalents	45	51
Total Cash, Cash Equivalents and Restricted Cash	321	382
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	323	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	1	1
Price risk management assets:
Total Assets	1	1
Price risk management liabilities:
Interest rate swaps	5	7
Gas Contracts	33	41
Total price risk management liabilities	38	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	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	0	0
Gas Contracts	1	19
Total price risk management liabilities	1	19
Gas Contracts, Liability, Settlements	(18)
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	21	51
Price risk management assets:
Total Assets	21	51
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	21	51
Price risk management assets:
Total Assets	21	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	22	26
Total Cash, Cash Equivalents and Restricted Cash	30	44
Price risk management assets:
Total Assets	30	44
Price risk management liabilities:
Interest rate swaps	5	7
Total price risk management liabilities	5	7
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8	18
Restricted cash and cash equivalents	22	26
Total Cash, Cash Equivalents and Restricted Cash	30	44
Price risk management assets:
Total Assets	30	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	5	7
Total price risk management liabilities	5	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	12	14
Restricted cash and cash equivalents	22	24
Total Cash, Cash Equivalents and Restricted Cash	34	38
Price risk management assets:
Total Assets	34	38
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	12	14
Restricted cash and cash equivalents	22	24
Total Cash, Cash Equivalents and Restricted Cash	34	38
Price risk management assets:
Total Assets	34	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