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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 676 | $ 341
Restricted cash and cash equivalents | 24 | 26
Price risk management assets: |  |
Foreign currency contracts | 164 | 211
Cross-currency swaps | 160 | 188
Total price risk management assets | 324 | 399
Total assets | 1,024 | 766
Price risk management liabilities: |  |
Interest rate swaps | 31 | 31
Foreign currency contracts | 167 | 27
Total price risk management liabilities | 198 | 58
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 676 | 341
Restricted cash and cash equivalents | 24 | 26
Price risk management assets: |  |
Foreign currency contracts | 0 | 0
Cross-currency swaps | 0 | 0
Total price risk management assets | 0 | 0
Total assets | 700 | 367
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
Price risk management assets: |  |
Foreign currency contracts | 164 | 211
Cross-currency swaps | 160 | 188
Total price risk management assets | 324 | 399
Total assets | 324 | 399
Price risk management liabilities: |  |
Interest rate swaps | 31 | 31
Foreign currency contracts | 167 | 27
Total price risk management liabilities | 198 | 58
Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 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 | 243 | 13
Restricted cash and cash equivalents | 2 | 2
Price risk management assets: |  |
Total assets | 245 | 15
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 243 | 13
Restricted cash and cash equivalents | 2 | 2
Price risk management assets: |  |
Total assets | 245 | 15
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 | 40 | 13
Cash collateral posted to counterparties | 1 | 3
Price risk management assets: |  |
Total assets | 41 | 16
Price risk management liabilities: |  |
Interest rate swaps | 29 | 31
Total price risk management liabilities | 29 | 31
LG And E And KU Energy LLC [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 40 | 13
Cash collateral posted to counterparties | 1 | 3
Price risk management assets: |  |
Total assets | 41 | 16
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
Cash collateral posted to counterparties | 0 | 0
Price risk management assets: |  |
Total assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 29 | 31
Total price risk management liabilities | 29 | 31
LG And E And KU Energy LLC [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Cash collateral posted to counterparties | 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 | 9 | 5
Cash collateral posted to counterparties | 1 | 3
Price risk management assets: |  |
Total assets | 10 | 8
Price risk management liabilities: |  |
Interest rate swaps | 29 | 31
Total price risk management liabilities | 29 | 31
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 9 | 5
Cash collateral posted to counterparties | 1 | 3
Price risk management assets: |  |
Total assets | 10 | 8
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
Cash collateral posted to counterparties | 0 | 0
Price risk management assets: |  |
Total assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 29 | 31
Total price risk management liabilities | 29 | 31
Louisville Gas And Electric Co [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Cash collateral posted to counterparties | 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 | 31 | 7
Price risk management assets: |  |
Total assets | 31 | 7
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 31 | 7
Price risk management assets: |  |
Total assets | 31 | 7
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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