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Utility Rate Regulation - Regulatory Assets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 28 | $ 34
Noncurrent regulatory assets | 1,519 | 1,504
Environmental Cost Recovery [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 5
Generation Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 2 | 6
Smart Meter Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 15 | 15
Act 129 Compliance Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 7 | 0
Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 866 | 880
Taxes Recoverable Through Future Rates [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 3 | 3
Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 47 | 33
Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 51 | 54
Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 22 | 26
Terminated Interest Rate Swap [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 91 | 92
Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 176 | 173
Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 247 | 234
Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 3
Other Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 5 | 5
Noncurrent regulatory assets | 9 | 9
PPL Electric Utilities Corp [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 16 | 16
Noncurrent regulatory assets | 726 | 709
PPL Electric Utilities Corp [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Generation Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Smart Meter Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 15 | 15
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 7 | 0
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 496 | 504
PPL Electric Utilities Corp [Member] | Taxes Recoverable Through Future Rates [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 3 | 3
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 17 | 0
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 27 | 29
PPL Electric Utilities Corp [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Terminated Interest Rate Swap [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 176 | 173
PPL Electric Utilities Corp [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Other Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 1 | 1
Noncurrent regulatory assets | 0 | 0
LG And E And KU Energy LLC [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 12 | 18
Noncurrent regulatory assets | 793 | 795
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 5
LG And E And KU Energy LLC [Member] | Generation Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 2 | 6
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 370 | 376
LG And E And KU Energy LLC [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 30 | 33
LG And E And KU Energy LLC [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 24 | 25
LG And E And KU Energy LLC [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 22 | 26
LG And E And KU Energy LLC [Member] | Terminated Interest Rate Swap [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 91 | 92
LG And E And KU Energy LLC [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 247 | 234
LG And E And KU Energy LLC [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 3
LG And E And KU Energy LLC [Member] | Other Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 4 | 4
Noncurrent regulatory assets | 9 | 9
Louisville Gas And Electric Co [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 10 | 12
Noncurrent regulatory assets | 406 | 411
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 5
Louisville Gas And Electric Co [Member] | Generation Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 230 | 234
Louisville Gas And Electric Co [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 16 | 18
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 15 | 16
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 22 | 26
Louisville Gas And Electric Co [Member] | Terminated Interest Rate Swap [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 53 | 54
Louisville Gas And Electric Co [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 67 | 61
Louisville Gas And Electric Co [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 3
Louisville Gas And Electric Co [Member] | Other Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 4 | 4
Noncurrent regulatory assets | 3 | 2
Kentucky Utilities Co [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 2 | 6
Noncurrent regulatory assets | 387 | 384
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Generation Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 2 | 6
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 140 | 142
Kentucky Utilities Co [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 14 | 15
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 9 | 9
Kentucky Utilities Co [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Terminated Interest Rate Swap [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 38 | 38
Kentucky Utilities Co [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 180 | 173
Kentucky Utilities Co [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Other Regulatory Assets [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Noncurrent regulatory assets | $ 6 | $ 7

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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