Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 4,249	$ 3,571
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	4,250	3,572
Special Use Funds [Abstract]
Money market fund	1	2
Commingled debt fund measured at NAV	20	22
Commingled equity fund measured at NAV	19	21
Total special use funds	40	45
Price risk management assets:
Total Assets	4,290	3,617
Price risk management liabilities:
Interest rate swaps	14	18
Total price risk management liabilities	14	18
Level 1 [Member]
Assets
Cash and cash equivalents	4,249	3,571
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	4,250	3,572
Special Use Funds [Abstract]
Money market fund	1	2
Total special use funds	1	2
Price risk management assets:
Total Assets	4,251	3,574
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
Total Cash, Cash Equivalents and Restricted Cash	0	0
Special Use Funds [Abstract]
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	14	18
Total price risk management liabilities	14	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
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	46	21
Price risk management assets:
Total Assets	46	21
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	46	21
Price risk management assets:
Total Assets	46	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	9	9
Price risk management assets:
Total Assets	9	9
Price risk management liabilities:
Interest rate swaps	14	18
Total price risk management liabilities	14	18
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	9	9
Price risk management assets:
Total Assets	9	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	14	18
Total price risk management liabilities	14	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	8	13
Price risk management assets:
Total Assets	8	13
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8	13
Price risk management assets:
Total Assets	8	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