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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 852 | $ 485
Restricted cash and cash equivalents | 23 | 26
Special use funds | 65 | 0
Price risk management assets: |  |
Foreign currency contracts | 163 | 163
Cross-currency swaps | 100 | 101
Total price risk management assets | 263 | 264
Total assets | 1,203 | 775
Price risk management liabilities: |  |
Interest rate swaps | 21 | 26
Foreign currency contracts | 53 | 148
Total price risk management liabilities | 74 | 174
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 852 | 485
Restricted cash and cash equivalents | 23 | 26
Special use funds | 65 | 0
Price risk management assets: |  |
Foreign currency contracts | 0 | 0
Cross-currency swaps | 0 | 0
Total price risk management assets | 0 | 0
Total assets | 940 | 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 | 163 | 163
Cross-currency swaps | 100 | 101
Total price risk management assets | 263 | 264
Total assets | 263 | 264
Price risk management liabilities: |  |
Interest rate swaps | 21 | 26
Foreign currency contracts | 53 | 148
Total price risk management liabilities | 74 | 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 | 489 | 49
Restricted cash and cash equivalents | 2 | 2
Price risk management assets: |  |
Total assets | 491 | 51
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 489 | 49
Restricted cash and cash equivalents | 2 | 2
Price risk management assets: |  |
Total assets | 491 | 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 | 39 | 30
Price risk management assets: |  |
Total assets | 39 | 30
Price risk management liabilities: |  |
Interest rate swaps | 21 | 26
Total price risk management liabilities | 21 | 26
LG And E And KU Energy LLC [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 39 | 30
Price risk management assets: |  |
Total assets | 39 | 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 | 21 | 26
Total price risk management liabilities | 21 | 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 | 19 | 15
Price risk management assets: |  |
Total assets | 19 | 15
Price risk management liabilities: |  |
Interest rate swaps | 21 | 26
Total price risk management liabilities | 21 | 26
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 19 | 15
Price risk management assets: |  |
Total assets | 19 | 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 | 21 | 26
Total price risk management liabilities | 21 | 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 | 20 | 15
Price risk management assets: |  |
Total assets | 20 | 15
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 20 | 15
Price risk management assets: |  |
Total assets | 20 | 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

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