Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 621	$ 485
Restricted cash and cash equivalents	22	26
Special use funds	59	0
Price risk management assets:
Foreign currency contracts	202	163
Cross-currency swaps	135	101
Total price risk management assets	337	264
Total Assets	1,039	775
Price risk management liabilities:
Interest rate swaps	20	26
Foreign currency contracts	2	148
Total price risk management liabilities	22	174
Level 1 [Member]
Assets
Cash and cash equivalents	621	485
Restricted cash and cash equivalents	22	26
Special use funds	59	0
Price risk management assets:
Foreign currency contracts	0	0
Cross-currency swaps	0	0
Total price risk management assets	0	0
Total Assets	702	511
Price risk management liabilities:
Interest rate swaps	0	0
Foreign currency 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
Special use funds	0	0
Price risk management assets:
Foreign currency contracts	202	163
Cross-currency swaps	135	101
Total price risk management assets	337	264
Total Assets	337	264
Price risk management liabilities:
Interest rate swaps	20	26
Foreign currency contracts	2	148
Total price risk management liabilities	22	174
Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Special use funds	0	0
Price risk management assets:
Foreign currency contracts	0	0
Cross-currency swaps	0	0
Total price risk management assets	0	0
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	0	0
Foreign currency contracts	0	0
Total price risk management liabilities	0	0
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	267	49
Restricted cash and cash equivalents	2	2
Price risk management assets:
Total Assets	269	51
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	267	49
Restricted cash and cash equivalents	2	2
Price risk management assets:
Total Assets	269	51
PPL Electric Utilities Corp [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Restricted 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
Restricted cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
LG And E And KU Energy LLC [Member]
Assets
Cash and cash equivalents	24	30
Price risk management assets:
Total Assets	24	30
Price risk management liabilities:
Interest rate swaps	20	26
Total price risk management liabilities	20	26
LG And E And KU Energy LLC [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	24	30
Price risk management assets:
Total Assets	24	30
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
LG And E And KU Energy LLC [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	20	26
Total price risk management liabilities	20	26
LG And E And KU Energy LLC [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
Louisville Gas And Electric Co [Member]
Assets
Cash and cash equivalents	10	15
Price risk management assets:
Total Assets	10	15
Price risk management liabilities:
Interest rate swaps	20	26
Total price risk management liabilities	20	26
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	10	15
Price risk management assets:
Total Assets	10	15
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	20	26
Total price risk management liabilities	20	26
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	14	15
Price risk management assets:
Total Assets	14	15
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	14	15
Price risk management assets:
Total Assets	14	15
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