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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 670 | $ 621
Restricted cash and cash equivalents | 20 | 22
Special Use Funds [Abstract] |  |
Money market fund | 2 | 59
Commingled debt fund measured at NAV | 29 | 0
Commingled equity fund measured at NAV | 28 | 0
Total special use funds | 59 | 59
Price risk management assets: |  |
Foreign currency contracts | 224 | 202
Cross-currency swaps | 195 | 135
Total price risk management assets | 419 | 337
Total Assets | 1,168 | 1,039
Price risk management liabilities: |  |
Interest rate swaps | 25 | 20
Foreign currency contracts | 3 | 2
Total price risk management liabilities | 28 | 22
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 670 | 621
Restricted cash and cash equivalents | 20 | 22
Special Use Funds [Abstract] |  |
Money market fund | 2 | 59
Total special use funds | 2 | 59
Price risk management assets: |  |
Foreign currency contracts | 0 | 0
Cross-currency swaps | 0 | 0
Total price risk management assets | 0 | 0
Total Assets | 692 | 702
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 [Abstract] |  |
Money market fund | 0 | 0
Total special use funds | 0 | 0
Price risk management assets: |  |
Foreign currency contracts | 224 | 202
Cross-currency swaps | 195 | 135
Total price risk management assets | 419 | 337
Total Assets | 419 | 337
Price risk management liabilities: |  |
Interest rate swaps | 25 | 20
Foreign currency contracts | 3 | 2
Total price risk management liabilities | 28 | 22
Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Special Use Funds [Abstract] |  |
Money market fund | 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 | 27 | 267
Restricted cash and cash equivalents | 2 | 2
Price risk management assets: |  |
Total Assets | 29 | 269
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 27 | 267
Restricted cash and cash equivalents | 2 | 2
Price risk management assets: |  |
Total Assets | 29 | 269
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 | 30 | 24
Price risk management assets: |  |
Total Assets | 30 | 24
Price risk management liabilities: |  |
Interest rate swaps | 25 | 20
Total price risk management liabilities | 25 | 20
LG And E And KU Energy LLC [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 30 | 24
Price risk management assets: |  |
Total Assets | 30 | 24
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 | 25 | 20
Total price risk management liabilities | 25 | 20
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 | 12 | 10
Price risk management assets: |  |
Total Assets | 12 | 10
Price risk management liabilities: |  |
Interest rate swaps | 25 | 20
Total price risk management liabilities | 25 | 20
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 12 | 10
Price risk management assets: |  |
Total Assets | 12 | 10
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 | 25 | 20
Total price risk management liabilities | 25 | 20
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 | 18 | 14
Price risk management assets: |  |
Total Assets | 18 | 14
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 18 | 14
Price risk management assets: |  |
Total Assets | 18 | 14
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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