Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 303	$ 3,571
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	304	3,572
Special Use Funds [Abstract]
Money market fund	1	2
Commingled debt fund measured at NAV	15	22
Commingled equity fund measured at NAV	12	21
Total special use funds	28	45
Gas Contracts	76	0
Price risk management assets:
Total Assets	408	3,617
Price risk management liabilities:
Interest rate swaps	7	18
Gas Contracts	5	0
Total price risk management liabilities	12	18
Level 1 [Member]
Assets
Cash and cash equivalents	303	3,571
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	304	3,572
Special Use Funds [Abstract]
Money market fund	1	2
Total special use funds	1	2
Gas Contracts	0	0
Price risk management assets:
Total Assets	305	3,574
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	76	0
Price risk management assets:
Total Assets	76	0
Price risk management liabilities:
Interest rate swaps	7	18
Gas Contracts	5	0
Total price risk management liabilities	12	18
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	0	0
Total price risk management liabilities	0	0
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	22	21
Price risk management assets:
Total Assets	22	21
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	22	21
Price risk management assets:
Total Assets	22	21
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	25	9
Price risk management assets:
Total Assets	25	9
Price risk management liabilities:
Interest rate swaps	7	18
Total price risk management liabilities	7	18
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	25	9
Price risk management assets:
Total Assets	25	9
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	7	18
Total price risk management liabilities	7	18
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	25	13
Price risk management assets:
Total Assets	25	13
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	25	13
Price risk management assets:
Total Assets	25	13
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