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, 2024	Dec. 31, 2023
Assets
Cash and cash equivalents	$ 542	$ 331
Restricted cash and cash equivalents	41	51
Total Cash, Cash Equivalents and Restricted Cash	583	382
Special Use Funds [Abstract]
Money market fund	1	1
Commingled debt fund measured at NAV	4	9
Commingled equity fund measured at NAV	4	8
Total special use funds	9	18
Gas Contracts	2	1
Price risk management assets:
Total Assets	594	401
Price risk management liabilities:
Interest rate swaps	7	7
Gas Contracts	27	60
Total price risk management liabilities	34	67
Level 1 [Member]
Assets
Cash and cash equivalents	542	331
Restricted cash and cash equivalents	41	51
Total Cash, Cash Equivalents and Restricted Cash	583	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	584	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	7	7
Gas Contracts	22	41
Total price risk management liabilities	29	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	1	0
Price risk management assets:
Total Assets	1	0
Price risk management liabilities:
Interest rate swaps	0	0
Gas Contracts	5	19
Total price risk management liabilities	5	19
Level 3 [Member] | Gas Contracts
Price risk management liabilities:
Gas Contracts, Liability, Settlements	(19)
Gas Contracts, Asset (Liability), Balance	4	19
Total unrealized gains (losses) on Regulatory Asset/Regulatory Liability	4
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	35	51
Price risk management assets:
Total Assets	35	51
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	35	51
Price risk management assets:
Total Assets	35	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	10	18
Restricted cash and cash equivalents	20	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	7	7
Total price risk management liabilities	7	7
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	10	18
Restricted cash and cash equivalents	20	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	7	7
Total price risk management liabilities	7	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	16	14
Restricted cash and cash equivalents	20	24
Total Cash, Cash Equivalents and Restricted Cash	36	38
Price risk management assets:
Total Assets	36	38
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	16	14
Restricted cash and cash equivalents	20	24
Total Cash, Cash Equivalents and Restricted Cash	36	38
Price risk management assets:
Total Assets	36	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