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Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Integer MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Domestic electric and gas revenue |  |  |  |  |  |  |  |  | $ 5,491 | $ 5,351 | $ 5,297
U.K. operating revenues |  |  |  |  |  |  |  |  | 2,268 | 2,091 | 2,207
Domestic - other |  |  |  |  |  |  |  |  | 26 | 5 | 13
Operating Revenues | $ 1,939 | $ 1,872 | $ 1,848 | $ 2,126 | $ 1,926 | $ 1,845 | $ 1,725 | $ 1,951 | 7,785 | 7,447 | 7,517
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest costs, capitalized during the period |  |  |  |  |  |  |  |  | $ 15 | 11 | $ 11
Defined Benefits [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization |  |  |  |  |  |  |  |  | 30.00% |  |
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 10.00% |  |
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 30.00% |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage to be attained of likelihood of uncertain tax position being realized |  |  |  |  |  |  |  |  | 50.00% |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 303 |  |  |  | 320 |  |  |  | $ 303 | 320 |
Fuel [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 98 |  |  |  | 107 |  |  |  | 98 | 107 |
Natural Gas Stored Underground [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 41 |  |  |  | 43 |  |  |  | 41 | 43 |
Material And Supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 164 |  |  |  | 170 |  |  |  | $ 164 | $ 170 |
Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 2.77% | 2.65% | 2.73%
Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 51 |  |  |  | 54 | $ 51 | $ 54 | $ 41
Additions charged to income |  |  |  |  |  |  |  |  | 41 | 28 | 44
Additions charged to other accounts |  |  |  |  |  |  |  |  | 3 | (1) | 0
Deductions |  |  |  |  |  |  |  |  | 39 | 30 | 31
Balance at end of period | 56 |  |  |  | 51 |  |  |  | $ 56 | 51 | 54
WPD [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of lag in reporting results for WPD (in months) | Integer |  |  |  |  |  |  |  |  | 1 |  |
Revenue Recognition (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of regulatory years later future demand revenue is affected |  |  |  |  |  |  |  |  | 2 years |  |
Percentage WPD's distribution network operators are able to retain of any under-spends |  |  |  |  |  |  |  |  | 70.00% |  |
Percentage WPD's distribution network operators bear of any over-spends |  |  |  |  |  |  |  |  | 70.00% |  |
Period of lag between incentives and penalties are reflected in customers' rates |  |  |  |  |  |  |  |  | 2 years |  |
Refunded/recovered period of lag for recovery of over and under-recovered amounts arising from 2014/15 onwards |  |  |  |  |  |  |  |  | 2 years |  |
Previous refunded/recovered period of lag for recovery of over and under-recovered amounts |  |  |  |  |  |  |  |  | 1 year |  |
LGE [Member] | Ohio Valley Electric Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of other electric utilities that are equity owners | Integer |  |  |  |  |  |  |  |  | 10 |  |
Number of other companies power is supplied to | Integer |  |  |  |  |  |  |  |  | 11 |  |
Ownership percentage |  |  |  |  |  |  |  |  | 5.63% |  |
Generation capacity in terms of ownership percentage (in MW) | MW |  |  |  |  |  |  |  |  | 120 |  |
KU [Member] | Ohio Valley Electric Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of other electric utilities that are equity owners | Integer |  |  |  |  |  |  |  |  | 10 |  |
Number of other companies power is supplied to | Integer |  |  |  |  |  |  |  |  | 11 |  |
Ownership percentage |  |  |  |  |  |  |  |  | 2.50% |  |
Generation capacity in terms of ownership percentage (in MW) | MW |  |  |  |  |  |  |  |  | 53 |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 573 | $ 548 | $ 517 | 639 | 575 | $ 547 | $ 500 | 573 | $ 2,277 | 2,195 | $ 2,156
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  |  |  |  |  |  | 5 years |  |
Defined Benefits [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization |  |  |  |  |  |  |  |  | 30.00% |  |
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 10.00% |  |
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 30.00% |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage to be attained of likelihood of uncertain tax position being realized |  |  |  |  |  |  |  |  | 50.00% |  |
Intercompany tax receivables (payables) | 19 |  |  |  | 61 |  |  |  | $ 19 | $ 61 |
PPL Electric Utilities Corp [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.01% | 2.86% | 2.63%
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 24 |  |  |  | 28 | $ 24 | $ 28 | $ 16
Additions charged to income |  |  |  |  |  |  |  |  | 29 | 18 | 35
Additions charged to other accounts |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deductions |  |  |  |  |  |  |  |  | 26 | 22 | 23
Balance at end of period | 27 |  |  |  | 24 |  |  |  | 27 | 24 | 28
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 3,214 | 3,156 | $ 3,141
Defined Benefits [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization |  |  |  |  |  |  |  |  | 30.00% |  |
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 10.00% |  |
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 30.00% |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage to be attained of likelihood of uncertain tax position being realized |  |  |  |  |  |  |  |  | 50.00% |  |
Intercompany tax receivables (payables) | (16) |  |  |  | (23) |  |  |  | $ (16) | (23) |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 248 |  |  |  | 254 |  |  |  | 248 | 254 |
LG And E And KU Energy LLC [Member] | Fuel [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 98 |  |  |  | 107 |  |  |  | 98 | 107 |
LG And E And KU Energy LLC [Member] | Natural Gas Stored Underground [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 41 |  |  |  | 43 |  |  |  | 41 | 43 |
LG And E And KU Energy LLC [Member] | Material And Supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 109 |  |  |  | 104 |  |  |  | $ 109 | $ 104 |
LG And E And KU Energy LLC [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.69% | 3.64% | 3.69%
LG And E And KU Energy LLC [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 25 |  |  |  | 24 | $ 25 | $ 24 | $ 23
Additions charged to income |  |  |  |  |  |  |  |  | 10 | 8 | 8
Additions charged to other accounts |  |  |  |  |  |  |  |  | 3 | (1) | 0
Deductions |  |  |  |  |  |  |  |  | 11 | 6 | 7
Balance at end of period | 27 |  |  |  | 25 |  |  |  | $ 27 | 25 | 24
LG And E And KU Energy LLC [Member] | LGE [Member] | Ohio Valley Electric Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of other electric utilities that are equity owners | Integer |  |  |  |  |  |  |  |  | 10 |  |
Number of other companies power is supplied to | Integer |  |  |  |  |  |  |  |  | 11 |  |
Ownership percentage |  |  |  |  |  |  |  |  | 5.63% |  |
Generation capacity in terms of ownership percentage (in MW) | MW |  |  |  |  |  |  |  |  | 120 |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Ohio Valley Electric Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of other electric utilities that are equity owners | Integer |  |  |  |  |  |  |  |  | 10 |  |
Number of other companies power is supplied to | Integer |  |  |  |  |  |  |  |  | 11 |  |
Ownership percentage |  |  |  |  |  |  |  |  | 2.50% |  |
Generation capacity in terms of ownership percentage (in MW) | MW |  |  |  |  |  |  |  |  | 53 |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 1,496 | 1,453 | $ 1,430
Defined Benefits [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization |  |  |  |  |  |  |  |  | 30.00% |  |
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 10.00% |  |
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 30.00% |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage to be attained of likelihood of uncertain tax position being realized |  |  |  |  |  |  |  |  | 50.00% |  |
Intercompany tax receivables (payables) | 0 |  |  |  | 0 |  |  |  | $ 0 | 0 |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 127 |  |  |  | 131 |  |  |  | 127 | 131 |
Louisville Gas And Electric Co [Member] | Fuel [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 42 |  |  |  | 45 |  |  |  | 42 | 45 |
Louisville Gas And Electric Co [Member] | Natural Gas Stored Underground [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 41 |  |  |  | 43 |  |  |  | 41 | 43 |
Louisville Gas And Electric Co [Member] | Material And Supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 44 |  |  |  | 43 |  |  |  | $ 44 | $ 43 |
Louisville Gas And Electric Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.63% | 3.63% | 3.58%
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of other electric utilities that are equity owners | Integer |  |  |  |  |  |  |  |  | 10 |  |
Number of other companies power is supplied to | Integer |  |  |  |  |  |  |  |  | 11 |  |
Ownership percentage |  |  |  |  |  |  |  |  | 5.63% |  |
Generation capacity in terms of ownership percentage (in MW) | MW |  |  |  |  |  |  |  |  | 120 |  |
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1 |  |  |  | 2 | $ 1 | $ 2 | $ 1
Additions charged to income |  |  |  |  |  |  |  |  | 4 | 2 | 2
Additions charged to other accounts |  |  |  |  |  |  |  |  | 1 | (1) | 1
Deductions |  |  |  |  |  |  |  |  | 5 | 2 | 2
Balance at end of period | 1 |  |  |  | 1 |  |  |  | 1 | 1 | 2
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 1,760 | 1,744 | $ 1,749
Defined Benefits [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization |  |  |  |  |  |  |  |  | 30.00% |  |
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 10.00% |  |
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis |  |  |  |  |  |  |  |  | 30.00% |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage to be attained of likelihood of uncertain tax position being realized |  |  |  |  |  |  |  |  | 50.00% |  |
Intercompany tax receivables (payables) | (5) |  |  |  | 0 |  |  |  | $ (5) | 0 |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 121 |  |  |  | 123 |  |  |  | 121 | 123 |
Kentucky Utilities Co [Member] | Fuel [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 56 |  |  |  | 62 |  |  |  | 56 | 62 |
Kentucky Utilities Co [Member] | Natural Gas Stored Underground [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Kentucky Utilities Co [Member] | Material And Supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 65 |  |  |  | 61 |  |  |  | $ 65 | $ 61 |
Kentucky Utilities Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.74% | 3.66% | 3.77%
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Investments in Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of other electric utilities that are equity owners | Integer |  |  |  |  |  |  |  |  | 10 |  |
Number of other companies power is supplied to | Integer |  |  |  |  |  |  |  |  | 11 |  |
Ownership percentage |  |  |  |  |  |  |  |  | 2.50% |  |
Generation capacity in terms of ownership percentage (in MW) | MW |  |  |  |  |  |  |  |  | 53 |  |
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 1 |  |  |  | $ 2 | $ 1 | $ 2 | $ 2
Additions charged to income |  |  |  |  |  |  |  |  | 5 | 4 | 4
Additions charged to other accounts |  |  |  |  |  |  |  |  | 2 | (1) | 0
Deductions |  |  |  |  |  |  |  |  | 6 | 4 | 4
Balance at end of period | $ 2 |  |  |  | $ 1 |  |  |  | $ 2 | $ 1 | $ 2

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- Definition The number of companies that are supplied power by an investment in equity securities, excluding LG&E and KU. + References No definition available. + Details
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- Definition Generation capacity, in MW, of power plants owned and operated by an investment in equity securities. + References No definition available. + Details
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- Definition Under the accelerated method the maximum percentage of gains and losses of the greater of the plan's projected benefit obligation or the market-related value of the plan assets amortized on a straight line basis over the estimated average future service period of plan participants. + References No definition available. + Details
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- Definition Under the accelerated method the minimum percentage of gains and losses of the greater of the plan's projected benefit obligation or the market-related value of the plan assets amortized on a straight line basis over the estimated average future service period of plan participants. + References No definition available. + Details
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- Definition Percentage WPD's distribution network operators are able to retain of any amounts not spent against the RIIO-ED1 plan. + References No definition available. + Details
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- Definition A percentage that relates to the recognition of uncertain tax positions. The measurement process is applied only after satisfying the "more likely than not" recognition element. Measurement determines what amount of a tax position will be sustainable upon a potential examination or settlement. If upon measuring, the tax effect produces a range, the company may claim the highest tax benefit from that range as long as it exceeds this percentage of likely of being realized using a probability analysis. + References No definition available. + Details
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