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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |
Support Costs (Details) [Abstract] |  |  |
Support cost allocations from subsidiary of parent to registrant | $ 51 | $ 37 |
PPL Electric Utilities Corp [Member] | PPL EU Services [Member] |  |  |
Support Costs (Details) [Abstract] |  |  |
Support cost allocations from subsidiary of parent to registrant | 18 | 17 |
LG And E And KU Energy LLC [Member] |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |
Notes payable to affiliates | 82 |  | $ 163
Long-term debt to affiliate | 400 |  | $ 400
Interest Expense with Affiliate | 4 | 4 |
LG And E And KU Energy LLC [Member] | PPL Services [Member] |  |  |
Support Costs (Details) [Abstract] |  |  |
Support cost allocations from subsidiary of parent to registrant | 6 | 5 |
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member] |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |
Intercompany note with affiliate maximum borrowing capacity | $ 225 |  |
Intercompany borrowings demand note rate on outstanding borrowing | 2.29% |  | 2.12%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |
Debt instrument term (in years) |  |  | 10 years
Long-term debt to affiliate |  |  | $ 400
Interest rate on ten-year note |  |  | 3.50%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |
Debt instrument term (in years) | 10 years |  |
Long-term debt to affiliate | $ 400 |  |
Interest rate on ten-year note | 3.50% |  |
Louisville Gas And Electric Co [Member] | LKS [Member] |  |  |
Intercompany Billings by LKS (Details) [Abstract] |  |  |
Intercompany billings between affiliates | $ 44 | 47 |
Kentucky Utilities Co [Member] | LKS [Member] |  |  |
Intercompany Billings by LKS (Details) [Abstract] |  |  |
Intercompany billings between affiliates | $ 44 | $ 56 |

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- Definition Costs billed to the company from a services affiliate. These costs include direct costs that are specifically related to the company or, for general costs that cannot be directly attributed, they are charged based on predetermined allocation factors and costs incurred where the service company has made a "convenience" payment on behalf of the company. + References No definition available. + Details
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- Definition Costs allocated to the company from a services affiliate. These costs include direct costs that are specifically related to the company or, for general costs that cannot be directly attributed, they are charged based on predetermined allocation factors. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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