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, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 353	$ 356
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	354	357
Special Use Funds [Abstract]
Money market fund	1	1
Commingled debt fund measured at NAV	10	13
Commingled equity fund measured at NAV	9	11
Total special use funds	20	25
Gas Contracts	0	25
Price risk management assets:
Total Assets	374	407
Price risk management liabilities:
Interest rate swaps	3	7
Gas Contracts	34	66
Total price risk management liabilities	37	73
Level 1 [Member]
Assets
Cash and cash equivalents	353	356
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	354	357
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	355	358
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	25
Price risk management assets:
Total Assets	0	25
Price risk management liabilities:
Interest rate swaps	3	7
Gas Contracts	23	10
Total price risk management liabilities	26	17
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	11	56
Gas Contracts, Liability, Purchases	11
Gas Contracts, Liability, Settlements	(56)
Total price risk management liabilities	11	56
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	56	25
Price risk management assets:
Total Assets	56	25
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	56	25
Price risk management assets:
Total Assets	56	25
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	93
Price risk management assets:
Total Assets	8	93
Price risk management liabilities:
Interest rate swaps	3	7
Total price risk management liabilities	3	7
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8	93
Price risk management assets:
Total Assets	8	93
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
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	3	7
Total price risk management liabilities	3	7
Louisville Gas And Electric Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	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	8	21
Price risk management assets:
Total Assets	8	21
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8	21
Price risk management assets:
Total Assets	8	21
Kentucky Utilities Co [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
Kentucky Utilities Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	$ 0	$ 0