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Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis Table) (Details) - Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 708 | $ 815
Restricted cash and cash equivalents | 19 | 21
Commingled debt fund measured at NAV | 26 | 29
Commingled equity fund measured at NAV | 25 | 27
Total special use funds | 51 | 56
Price risk management assets: |  |
Foreign currency contracts | 0 | 142
Cross-currency swaps | 146 | 154
Total price risk management assets | 146 | 296
Total Assets | 924 | 1,188
Price risk management liabilities: |  |
Interest rate swaps | 23 | 21
Foreign currency contracts | 137 | 5
Total price risk management liabilities | 160 | 26
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 708 | 815
Restricted cash and cash equivalents | 19 | 21
Total 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 | 727 | 836
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
Total special use funds | 0 | 0
Price risk management assets: |  |
Foreign currency contracts | 0 | 142
Cross-currency swaps | 146 | 154
Total price risk management assets | 146 | 296
Total Assets | 146 | 296
Price risk management liabilities: |  |
Interest rate swaps | 23 | 21
Foreign currency contracts | 137 | 5
Total price risk management liabilities | 160 | 26
Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Total 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 | 40 | 262
Restricted cash and cash equivalents | 0 | 2
Price risk management assets: |  |
Total Assets | 40 | 264
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 40 | 262
Restricted cash and cash equivalents | 0 | 2
Price risk management assets: |  |
Total Assets | 40 | 264
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 | 29 | 27
Price risk management assets: |  |
Total Assets | 29 | 27
Price risk management liabilities: |  |
Interest rate swaps | 23 | 21
Total price risk management liabilities | 23 | 21
LG And E And KU Energy LLC [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 29 | 27
Price risk management assets: |  |
Total Assets | 29 | 27
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 | 23 | 21
Total price risk management liabilities | 23 | 21
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 | 7 | 15
Price risk management assets: |  |
Total Assets | 7 | 15
Price risk management liabilities: |  |
Interest rate swaps | 23 | 21
Total price risk management liabilities | 23 | 21
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 7 | 15
Price risk management assets: |  |
Total Assets | 7 | 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 | 23 | 21
Total price risk management liabilities | 23 | 21
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 | 22 | 12
Price risk management assets: |  |
Total Assets | 22 | 12
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 22 | 12
Price risk management assets: |  |
Total Assets | 22 | 12
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

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