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Commitments and Contingencies - Guarantees and Other Assurances (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Integer | Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items] |  |
Recorded liability for all guarantees | $ 7 | $ 17
Other Guarantee (Numeric) [Abstract] |  |
Maximum aggregate coverage bodily injury and property damage | $ 225 |
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Indemnifications Related To WPD Midlands Acquisition [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure is not estimable | The maximum exposure and expiration of these indemnifications cannot be estimated because the maximum potential liability is not capped and the expiration date is not specified in the transaction documents. |
PPL Guarantee [Member] | Indemnification Guarantee [Member] | WPD Indemnifications For Entities In Liquidation and Sales Of Assets [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure | $ 11 |
Expiration date | 2020 |
Minimum Period In Years That Indemnifications Generally Expire | Integer | 2 |
Maximum Period In Years That Indemnifications Generally Expire | Integer | 7 |
PPL Guarantee [Member] | Financial Guarantee [Member] | WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure | $ 99 |
PPL Electric Guarantee [Member] | Indemnification Guarantee [Member] | Guarantee Of Inventory Value [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure | $ 17 |
Expiration date | 2020 |
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure | $ 201 |
Expiration date | 2021 |
Term of guarantee (in years) | 12 |
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues | $ 200 |
LKE Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure is not estimable | The maximum exposure and the expiration date of these potential obligations are not presently determinable. |
Contingent proportionate share of OVEC's outstanding debt | $ 117 |
PPL Electric Utilities Corp [Member] | Indemnification Guarantee [Member] | Guarantee Of Inventory Value [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure | $ 17 |
Expiration date | 2020 |
LG And E And KU Energy LLC [Member] |  |
Guarantor Obligations [Line Items] |  |
Recorded liability for all guarantees |  | $ 11
LG And E And KU Energy LLC [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure | $ 201 |
Expiration date | 2021 |
Term of guarantee (in years) | 12 |
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues | $ 200 |
LG And E And KU Energy LLC [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure is not estimable | The maximum exposure and the expiration date of these potential obligations are not presently determinable. |
Contingent proportionate share of OVEC's outstanding debt | $ 117 |
Louisville Gas And Electric Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure is not estimable | The maximum exposure and the expiration date of these potential obligations are not presently determinable. |
Louisville Gas And Electric Co [Member] | LGE And KU Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] |  |
Guarantor Obligations [Line Items] |  |
Contingent proportionate share of OVEC's outstanding debt | $ 81 |
Kentucky Utilities Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum exposure is not estimable | The maximum exposure and the expiration date of these potential obligations are not presently determinable. |
Kentucky Utilities Co [Member] | LGE And KU Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] |  |
Guarantor Obligations [Line Items] |  |
Contingent proportionate share of OVEC's outstanding debt | $ 36 |

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- Definition The expiration date of the guarantee or group of similar guarantees. + References No definition available. + Details
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- Definition The maximum exposure of a guarantee related to the termination of a lease related to certain non-utility generating stations in western Kentucky until July 2009. This portion of the guarantee relates to covering operational, regulatory and environmental commitments and indemnifications made under the agreement. + References No definition available. + Details
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- Definition Maximum aggregate insurance coverage for liability assumed under contract for bodily injury and property damage. + References No definition available. + Details
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- Definition The maximum period, in years, that indemnifications related to the dissolution of entities generally expire after the date of dissolution. + References No definition available. + Details
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- Definition The minimum period, in years, that indemnifications related to the dissolution of entities generally expire after the date of dissolution. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Entity's contingent proportionate share of OVEC's outstanding debt. + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition States the reasons why the guarantor is unable to develop an estimate of the maximum potential amount of future payments under its guarantee (or each group of similar guarantees). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Describe the approximate term of the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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