Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 3,571	$ 442
Restricted cash and cash equivalents	1	1
Money market fund	2	0
Commingled debt fund measured at NAV	22	26
Commingled equity fund measured at NAV	21	25
Total special use funds	45	51
Price risk management assets:
Total Assets	3,617	494
Price risk management liabilities:
Interest rate swaps	18	23
Total price risk management liabilities	18	23
Level 1 [Member]
Assets
Cash and cash equivalents	3,571	442
Restricted cash and cash equivalents	1	1
Money market fund	2	0
Total special use funds	2	0
Price risk management assets:
Total Assets	3,574	443
Price risk management liabilities:
Interest rate swaps	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
Money market fund	0	0
Total special use funds	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	18	23
Total price risk management liabilities	18	23
Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Money market fund	0	0
Total special use funds	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
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	21	40
Price risk management assets:
Total Assets	21	40
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	21	40
Price risk management assets:
Total Assets	21	40
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	9	7
Price risk management assets:
Total Assets	9	7
Price risk management liabilities:
Interest rate swaps	18	23
Total price risk management liabilities	18	23
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	9	7
Price risk management assets:
Total Assets	9	7
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	18	23
Total price risk management liabilities	18	23
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	13	22
Price risk management assets:
Total Assets	13	22
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	13	22
Price risk management assets:
Total Assets	13	22
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