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Accounting Policies (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) Integer | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2017 USD ($)
Utility Revenue (Details) [Abstract] |  |  |  |  |
Operating Revenues | $ 7,607 | $ 7,769 | $ 7,785 |  |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |
Cash and cash equivalents | 708 | 815 |  |  |
Restricted cash - current | 1 | 3 |  |  |
Restricted Cash - noncurrent | 18 | 18 |  |  |
Total Cash, Cash Equivalents and Restricted Cash | 727 | 836 | 643 |  | $ 511
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |  |
Interest costs, capitalized during the period | $ 9 | 10 | 15 |  |
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 | $ 361 | 332 |  |  |
Balance Sheet Classification of Deferred Taxes [Abstract] |  |  |  |  |
Goodwill | 3,274 | 3,198 | $ 3,162 |  |
Fuel [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 95 | 106 |  |  |
Natural Gas Stored Underground [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 30 | 35 |  |  |
Material And Supplies [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | $ 236 | $ 191 |  |  |
Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |
Weighted-average rates | 2.81% | 2.84% | 2.77% |  |
Allowance For Doubtful Accounts [Member] |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 58 | $ 56 | $ 51 |  |
Additions charged to income | 31 | 37 | 41 |  |
Additions charged to other accounts | 0 | 3 | 3 |  |
Deductions | 16 | 38 | 39 |  |
Balance at end of period | $ 75 | 58 | 56 |  |
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 |  |  |  |
Balance Sheet Classification of Deferred Taxes [Abstract] |  |  |  |  |
Goodwill |  |  |  | $ 2,500 |
PPL Electric Utilities Corp [Member] |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |
Operating Revenues | $ 2,331 | 2,358 | 2,277 |  |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |
Cash and cash equivalents | 40 | 262 |  |  |
Restricted cash - current | 0 | 2 |  |  |
Restricted Cash - noncurrent | 0 | 0 |  |  |
Total Cash, Cash Equivalents and Restricted Cash | 40 | 264 | 269 |  | 51
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |  |
Interest costs, capitalized during the period | $ 7 | 8 | $ 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) | $ (9) | 3 |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 59 | 33 |  |  |
PPL Electric Utilities Corp [Member] | Fuel [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 0 | 0 |  |  |
PPL Electric Utilities Corp [Member] | Natural Gas Stored Underground [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 0 | 0 |  |  |
PPL Electric Utilities Corp [Member] | Material And Supplies [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | $ 59 | $ 33 |  |  |
PPL Electric Utilities Corp [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |
Weighted-average rates | 2.99% | 3.05% | 3.01% |  |
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 28 | $ 27 | $ 24 |  |
Additions charged to income | 19 | 26 | 29 |  |
Additions charged to other accounts | 0 | 0 | 0 |  |
Deductions | 8 | 25 | 26 |  |
Balance at end of period | 41 | 28 | 27 |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |
Operating Revenues | 3,106 | 3,206 | 3,214 |  |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |
Cash and cash equivalents | $ 29 | 27 | $ 24 |  | 30
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) | $ (12) | (8) |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 242 | 250 |  |  |
Balance Sheet Classification of Deferred Taxes [Abstract] |  |  |  |  |
Goodwill | 996 | 996 |  |  |
LG And E And KU Energy LLC [Member] | Fuel [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 95 | 106 |  |  |
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 | 30 | 35 |  |  |
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 | $ 117 | $ 109 |  |  |
LG And E And KU Energy LLC [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |
Weighted-average rates | 4.00% | 3.96% | 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 | $ 28 | $ 27 | $ 25 |  |
Additions charged to income | 9 | 8 | 10 |  |
Additions charged to other accounts | 0 | 3 | 3 |  |
Deductions | 5 | 10 | 11 |  |
Balance at end of period | 32 | 28 | 27 |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |
Operating Revenues | 1,456 | 1,500 | 1,496 |  |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |
Cash and cash equivalents | $ 7 | 15 | $ 10 |  | 15
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) | $ (1) | (4) |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 119 | 122 |  |  |
Balance Sheet Classification of Deferred Taxes [Abstract] |  |  |  |  |
Goodwill | 389 | 389 |  |  |
Louisville Gas And Electric Co [Member] | Fuel [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 38 | 43 |  |  |
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 | 30 | 35 |  |  |
Louisville Gas And Electric Co [Member] | Material And Supplies [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | $ 51 | $ 44 |  |  |
Louisville Gas And Electric Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |
Weighted-average rates | 4.00% | 3.87% | 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 |  |
Additions charged to income | 4 | 2 | 4 |  |
Additions charged to other accounts | 0 | 2 | 1 |  |
Deductions | 2 | 4 | 5 |  |
Balance at end of period | 3 | 1 | 1 |  |
Kentucky Utilities Co [Member] |  |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |  |
Operating Revenues | 1,690 | 1,740 | 1,760 |  |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |  |
Cash and cash equivalents | $ 22 | 12 | $ 14 |  | $ 15
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) | $ (5) | (6) |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 123 | 128 |  |  |
Balance Sheet Classification of Deferred Taxes [Abstract] |  |  |  |  |
Goodwill | 607 | 607 |  |  |
Kentucky Utilities Co [Member] | Fuel [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 57 | 63 |  |  |
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 |  |  |
Kentucky Utilities Co [Member] | Material And Supplies [Member] |  |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |  |
Fuel, materials and supplies on the Balance Sheet | $ 66 | $ 65 |  |  |
Kentucky Utilities Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |  |
Weighted-average rates | 4.00% | 4.02% | 3.74% |  |
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 1 | $ 2 | $ 1 |  |
Additions charged to income | 4 | 4 | 5 |  |
Additions charged to other accounts | 0 | 1 | 2 |  |
Deductions | 3 | 6 | 6 |  |
Balance at end of period | $ 2 | $ 1 | $ 2 |  |

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