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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments And Hedging Activities [Line Items] |
Fair Value and Balance Sheet Location of Derivative Instruments | The following table presents the fair value and location of derivative instruments recorded on the Balance Sheets.
| December 31, 2018 |  | December 31, 2017
| Derivatives designated as hedging instruments |  | Derivatives not designated as hedging instruments |  | Derivatives designated as hedging instruments |  | Derivatives not designated as hedging instruments
| Assets |  | Liabilities |  | Assets |  | Liabilities |  | Assets |  | Liabilities |  | Assets |  | Liabilities
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets/Liabilities (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (b) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Cross-currency swaps (b) | 6 |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | — |  |  | — |
Foreign currency contracts | — |  |  | — |  |  | 103 |  |  | 2 |  |  | — |  |  | — |  |  | 45 |  |  | 67 |
Total current | 6 |  |  | — |  |  | 103 |  |  | 6 |  |  | 4 |  |  | — |  |  | 45 |  |  | 71 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets/Liabilities (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps (b) | — |  |  | — |  |  | — |  |  | 16 |  |  | — |  |  | — |  |  | — |  |  | 22 |
Cross-currency swaps (b) | 129 |  |  | — |  |  | — |  |  | — |  |  | 97 |  |  | — |  |  | — |  |  | — |
Foreign currency contracts | — |  |  | — |  |  | 99 |  |  | — |  |  | — |  |  | — |  |  | 118 |  |  | 81 |
Total noncurrent | 129 |  |  | — |  |  | 99 |  |  | 16 |  |  | 97 |  |  | — |  |  | 118 |  |  | 103 |
Total derivatives | $ | 135 |  |  | $ | — |  |  | $ | 202 |  |  | $ | 22 |  |  | $ | 101 |  |  | $ | — |  |  | $ | 163 |  |  | $ | 174 |
(a) | Current portion is included in "Price risk management assets" and "Other current liabilities" and noncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
(b) | Excludes accrued interest, if applicable.
Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet | The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities.
Derivative Relationships |  | Derivative Gain (Loss) Recognized in OCI (Effective Portion) |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
2018 |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 4 |  |  | Interest Expense |  | $ | (8 | ) |  | $ | — |
Cross-currency swaps |  | 41 |  |  | Other Income (Expense) - net |  | 42 |  |  | — |
|  |  |  | Interest Expense |  | 1 |  |  | — |
Total |  | $ | 45 |  |  |  |  | $ | 35 |  |  | $ | — |
Net Investment Hedges: |  |  |  |  |  |  |  |  |
Foreign currency contracts |  | $ | 11 |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | Interest Expense |  | $ | (9 | ) |  | $ | — |
Cross-currency swaps |  | (98 | ) |  | Other Income (Expense) - net |  | (82 | ) |  | — |
Total |  | $ | (98 | ) |  |  |  | $ | (91 | ) |  | $ | — |
Net Investment Hedges: |  |  |  |  |  |  |  |  |
Foreign currency contracts |  | $ | 1 |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | (21 | ) |  | Interest Expense |  | $ | (7 | ) |  | $ | — |
Cross-currency swaps |  | 130 |  |  | Other Income (Expense) - net |  | 116 |  |  | — |
|  |  |  | Interest Expense |  | 3 |  |  | — |
Total |  | $ | 109 |  |  |  |  | $ | 112 |  |  | $ | — |
Net Investment Hedges: |  |  |  |  |  |  |  |  |
Foreign currency contracts |  | $ | 2 |  |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  | 2018 |  | 2017 |  | 2016
Foreign currency contracts |  | Other Income (Expense) - net |  | $ | 150 |  |  | $ | (261 | ) |  | $ | 384 |
Interest rate swaps |  | Interest Expense |  | (5 | ) |  | (6 | ) |  | (7 | )
|  | Total |  | $ | 145 |  |  | $ | (267 | ) |  | $ | 377 |
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized as Regulatory Liabilities/Assets |  | 2018 |  | 2017 |  | 2016
Interest rate swaps |  | Regulatory assets - noncurrent |  | $ | 6 |  |  | $ | 5 |  |  | $ | 7 |
Derivative Positions Eligible for Offset with Related Cash Collateral | The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
|  | Assets |  | Liabilities
|  |  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
|  | Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 337 |  |  | $ | 2 |  |  | $ | 40 |  |  | $ | 295 |  |  | $ | 22 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 20 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 264 |  |  | $ | 107 |  |  | $ | 20 |  |  | $ | 137 |  |  | $ | 174 |  |  | $ | 107 |  |  | $ | — |  |  | $ | 67 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Credit Risk-Related Contingent Features | At December 31, 2018, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows:
|  | PPL |  | LKE |  | LG&E
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |
Aggregate fair value of collateral posted on these derivative instruments |  | — |  |  | — |  |  | — |
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) |  | 6 |  |  | 6 |  |  | 6 |
(a) | Includes the effect of net receivables and payables already recorded on the Balance Sheet.
LG And E And KU Energy LLC [Member] |
Derivative Instruments And Hedging Activities [Line Items] |
Fair Value and Balance Sheet Location of Derivative Instruments | The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments.
|  | December 31, 2018 |  | December 31, 2017
|  | Assets |  | Liabilities |  | Assets |  | Liabilities
Current: |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |
Assets/Liabilities: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |
Total current |  | — |  |  | 4 |  |  | — |  |  | 4 |
Noncurrent: |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |
Assets/Liabilities: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | — |  |  | 16 |  |  | — |  |  | 22 |
Total noncurrent |  | — |  |  | 16 |  |  | — |  |  | 22 |
Total derivatives |  | $ | — |  |  | $ | 20 |  |  | $ | — |  |  | $ | 26 |
Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet | The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets.
Derivative Instruments |  | Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2016
Interest rate swaps |  | Interest Expense |  | $ | (5 | ) |  | $ | (6 | ) |  | $ | (7 | )
Derivative Instruments |  | Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2016
Interest rate swaps |  | Regulatory assets - noncurrent |  | $ | 6 |  |  | $ | 5 |  |  | $ | 7 |
Derivative Positions Eligible for Offset with Related Cash Collateral | The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
|  | Assets |  | Liabilities
|  |  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
|  | Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 337 |  |  | $ | 2 |  |  | $ | 40 |  |  | $ | 295 |  |  | $ | 22 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 20 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 264 |  |  | $ | 107 |  |  | $ | 20 |  |  | $ | 137 |  |  | $ | 174 |  |  | $ | 107 |  |  | $ | — |  |  | $ | 67 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Credit Risk-Related Contingent Features | At December 31, 2018, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows:
|  | PPL |  | LKE |  | LG&E
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |
Aggregate fair value of collateral posted on these derivative instruments |  | — |  |  | — |  |  | — |
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) |  | 6 |  |  | 6 |  |  | 6 |
(a) | Includes the effect of net receivables and payables already recorded on the Balance Sheet.
Louisville Gas And Electric Co [Member] |
Derivative Instruments And Hedging Activities [Line Items] |
Fair Value and Balance Sheet Location of Derivative Instruments | The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments.
|  | December 31, 2018 |  | December 31, 2017
|  | Assets |  | Liabilities |  | Assets |  | Liabilities
Current: |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |
Assets/Liabilities: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 4 |  |  | $ | — |  |  | $ | 4 |
Total current |  | — |  |  | 4 |  |  | — |  |  | 4 |
Noncurrent: |  |  |  |  |  |  |  |  |  |
Price Risk Management |  |  |  |  |  |  |  |  |  |
Assets/Liabilities: |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | — |  |  | 16 |  |  | — |  |  | 22 |
Total noncurrent |  | — |  |  | 16 |  |  | — |  |  | 22 |
Total derivatives |  | $ | — |  |  | $ | 20 |  |  | $ | — |  |  | $ | 26 |
Pre-tax Gain (Loss) on Derivative Instruments Recognized in Income or on the Balance Sheet | The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets.
Derivative Instruments |  | Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2016
Interest rate swaps |  | Interest Expense |  | $ | (5 | ) |  | $ | (6 | ) |  | $ | (7 | )
Derivative Instruments |  | Location of Gain (Loss) |  | 2018 |  | 2017 |  | 2016
Interest rate swaps |  | Regulatory assets - noncurrent |  | $ | 6 |  |  | $ | 5 |  |  | $ | 7 |
Derivative Positions Eligible for Offset with Related Cash Collateral | The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
|  | Assets |  | Liabilities
|  |  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
|  | Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 337 |  |  | $ | 2 |  |  | $ | 40 |  |  | $ | 295 |  |  | $ | 22 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 20 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 264 |  |  | $ | 107 |  |  | $ | 20 |  |  | $ | 137 |  |  | $ | 174 |  |  | $ | 107 |  |  | $ | — |  |  | $ | 67 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Credit Risk-Related Contingent Features | At December 31, 2018, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows:
|  | PPL |  | LKE |  | LG&E
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features |  | $ | 6 |  |  | $ | 6 |  |  | $ | 6 |
Aggregate fair value of collateral posted on these derivative instruments |  | — |  |  | — |  |  | — |
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) |  | 6 |  |  | 6 |  |  | 6 |
(a) | Includes the effect of net receivables and payables already recorded on the Balance Sheet.
Kentucky Utilities Co [Member] |
Derivative Instruments And Hedging Activities [Line Items] |
Derivative Positions Eligible for Offset with Related Cash Collateral | The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
|  | Assets |  | Liabilities
|  |  |  | Eligible for Offset |  |  |  |  |  | Eligible for Offset |  |
|  | Gross |  | Derivative Instruments |  | Cash Collateral Received |  | Net |  | Gross |  | Derivative Instruments |  | Cash Collateral Pledged |  | Net
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 337 |  |  | $ | 2 |  |  | $ | 40 |  |  | $ | 295 |  |  | $ | 22 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 20 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | — |  |  | — |  |  | 20 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPL |  | $ | 264 |  |  | $ | 107 |  |  | $ | 20 |  |  | $ | 137 |  |  | $ | 174 |  |  | $ | 107 |  |  | $ | — |  |  | $ | 67 |
LKE |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
LG&E |  | — |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |  |  | — |  |  | 26 |

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