Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 460	$ 356
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	461	357
Special Use Funds [Abstract]
Money market fund	1	1
Commingled debt fund measured at NAV	12	13
Commingled equity fund measured at NAV	12	11
Total special use funds	25	25
Gas Contracts	1	25
Price risk management assets:
Total Assets	487	407
Price risk management liabilities:
Interest rate swaps	8	7
Gas Contracts	23	66
Total price risk management liabilities	31	73
Level 1 [Member]
Assets
Cash and cash equivalents	460	356
Restricted cash and cash equivalents	1	1
Total Cash, Cash Equivalents and Restricted Cash	461	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	462	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	1	25
Price risk management assets:
Total Assets	1	25
Price risk management liabilities:
Interest rate swaps	8	7
Gas Contracts	22	10
Total price risk management liabilities	30	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	1	56
Gas Contracts, Liability, Settlements	(55)
Total price risk management liabilities	1	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	28	93
Price risk management assets:
Total Assets	28	93
Price risk management liabilities:
Interest rate swaps	8	7
Total price risk management liabilities	8	7
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	28	93
Price risk management assets:
Total Assets	28	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	8	7
Total price risk management liabilities	8	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	9	21
Price risk management assets:
Total Assets	9	21
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	9	21
Price risk management assets:
Total Assets	9	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