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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Integer | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 1,954 | $ 1,933 | $ 1,803 | $ 2,079 | $ 1,939 | $ 1,872 | $ 1,848 | $ 2,126 | $ 7,769 | $ 7,785 | $ 7,447 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 815 |  |  |  | 621 |  |  |  | 815 | 621 |  |
Restricted cash - current | 3 |  |  |  | 3 |  |  |  | 3 | 3 |  |
Restricted Cash - noncurrent | 18 |  |  |  | 19 |  |  |  | 18 | 19 |  |
Total Cash, Cash Equivalents and Restricted Cash | 836 |  |  |  | 643 |  |  |  | 836 | 643 | 511 | $ 372
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Interest costs, capitalized during the period |  |  |  |  |  |  |  |  | $ 10 | 15 | $ 11 |
Discount Rate Change For United Kingdom Pension Plans Numeric [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 | 332 |  |  |  | 303 |  |  |  | $ 332 | 303 |  |
Fuel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 106 |  |  |  | 98 |  |  |  | 106 | 98 |  |
Natural Gas Stored Underground [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 35 |  |  |  | 41 |  |  |  | 35 | 41 |  |
Material And Supplies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 191 |  |  |  | 164 |  |  |  | $ 191 | $ 164 |  |
Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 2.84% | 2.77% | 2.65% |
Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 56 |  |  |  | 51 | $ 56 | $ 51 | $ 54 |
Additions charged to income |  |  |  |  |  |  |  |  | 37 | 41 | 28 |
Additions charged to other accounts |  |  |  |  |  |  |  |  | 3 | 3 | (1) |
Deductions |  |  |  |  |  |  |  |  | 38 | 39 | 30 |
Balance at end of period | 58 |  |  |  | 56 |  |  |  | $ 58 | 56 | 51 |
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 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | 602 | $ 590 | $ 521 | 645 | 573 | $ 548 | $ 517 | 639 | $ 2,358 | 2,277 | 2,195 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 262 |  |  |  | 267 |  |  |  | 262 | 267 |  |
Restricted cash - current | 2 |  |  |  | 2 |  |  |  | 2 | 2 |  |
Restricted Cash - noncurrent | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Total Cash, Cash Equivalents and Restricted Cash | 264 |  |  |  | 269 |  |  |  | $ 264 | 269 | $ 51 | 15
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  |  |  |  |  |  | 5 years |  |  |
Discount Rate Change For United Kingdom Pension Plans Numeric [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) | 3 |  |  |  | 19 |  |  |  | $ 3 | $ 19 |  |
PPL Electric Utilities Corp [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.05% | 3.01% | 2.86% |
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 27 |  |  |  | 24 | $ 27 | $ 24 | $ 28 |
Additions charged to income |  |  |  |  |  |  |  |  | 26 | 29 | 18 |
Additions charged to other accounts |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Deductions |  |  |  |  |  |  |  |  | 25 | 26 | 22 |
Balance at end of period | 28 |  |  |  | 27 |  |  |  | 28 | 27 | 24 |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 3,206 | 3,214 | 3,156 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 27 |  |  |  | 24 |  |  |  | $ 27 | 24 | $ 30 | 13
Discount Rate Change For United Kingdom Pension Plans Numeric [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) | (8) |  |  |  | (16) |  |  |  | $ (8) | (16) |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 250 |  |  |  | 248 |  |  |  | 250 | 248 |  |
LG And E And KU Energy LLC [Member] | Fuel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 106 |  |  |  | 98 |  |  |  | 106 | 98 |  |
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 | 35 |  |  |  | 41 |  |  |  | 35 | 41 |  |
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 |  |  |  | 109 |  |  |  | $ 109 | $ 109 |  |
LG And E And KU Energy LLC [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.96% | 3.69% | 3.64% |
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 |  |  |  | 27 |  |  |  | 25 | $ 27 | $ 25 | $ 24 |
Additions charged to income |  |  |  |  |  |  |  |  | 8 | 10 | 8 |
Additions charged to other accounts |  |  |  |  |  |  |  |  | 3 | 3 | (1) |
Deductions |  |  |  |  |  |  |  |  | 10 | 11 | 6 |
Balance at end of period | 28 |  |  |  | 27 |  |  |  | 28 | 27 | 25 |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,500 | 1,496 | 1,453 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 15 |  |  |  | 10 |  |  |  | $ 15 | 10 | $ 15 | 5
Discount Rate Change For United Kingdom Pension Plans Numeric [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) | (4) |  |  |  | 0 |  |  |  | $ (4) | 0 |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 122 |  |  |  | 127 |  |  |  | 122 | 127 |  |
Louisville Gas And Electric Co [Member] | Fuel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 43 |  |  |  | 42 |  |  |  | 43 | 42 |  |
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 | 35 |  |  |  | 41 |  |  |  | 35 | 41 |  |
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 |  |  |  | 44 |  |  |  | $ 44 | $ 44 |  |
Louisville Gas And Electric Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 3.87% | 3.63% | 3.63% |
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1 |  |  |  | 1 | $ 1 | $ 1 | $ 2 |
Additions charged to income |  |  |  |  |  |  |  |  | 2 | 4 | 2 |
Additions charged to other accounts |  |  |  |  |  |  |  |  | 2 | 1 | (1) |
Deductions |  |  |  |  |  |  |  |  | 4 | 5 | 2 |
Balance at end of period | 1 |  |  |  | 1 |  |  |  | 1 | 1 | 1 |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,740 | 1,760 | 1,744 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 12 |  |  |  | 14 |  |  |  | $ 12 | 14 | $ 15 | $ 7
Discount Rate Change For United Kingdom Pension Plans Numeric [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) | (6) |  |  |  | (5) |  |  |  | $ (6) | (5) |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 128 |  |  |  | 121 |  |  |  | 128 | 121 |  |
Kentucky Utilities Co [Member] | Fuel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 63 |  |  |  | 56 |  |  |  | 63 | 56 |  |
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 |  |  |  | 65 |  |  |  | $ 65 | $ 65 |  |
Kentucky Utilities Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average rates |  |  |  |  |  |  |  |  | 4.02% | 3.74% | 3.66% |
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 2 |  |  |  | $ 1 | $ 2 | $ 1 | $ 2 |
Additions charged to income |  |  |  |  |  |  |  |  | 4 | 5 | 4 |
Additions charged to other accounts |  |  |  |  |  |  |  |  | 1 | 2 | (1) |
Deductions |  |  |  |  |  |  |  |  | 6 | 6 | 4 |
Balance at end of period | $ 1 |  |  |  | $ 2 |  |  |  | $ 1 | $ 2 | $ 1 |

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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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