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Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Utility Revenue (Details) [Abstract] |  |  |  |
Operating Revenues | $ 5,783 | $ 5,474 | $ 5,602 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 3,571 | 442 |  |
Restricted cash - current | 1 | 1 |  |
Total Cash, Cash Equivalents and Restricted Cash | 3,572 | 443 | 660 | $ 621
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |
Interest costs, capitalized during the period | $ 6 | 7 | $ 9 |
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 | $ 322 | 302 |  |
Balance Sheet Classification of Deferred Taxes [Abstract] |  |  |  |
Goodwill | 716 | 716 |  |
Fuel [Member] |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 90 | 95 |  |
Natural Gas Stored Underground [Member] |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 54 | 30 |  |
Material And Supplies [Member] |  |  |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |
Fuel, materials and supplies on the Balance Sheet | $ 178 | $ 177 |  |
Regulated Operations [Member] | Utility Plant [Member] |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |
Weighted-average rates | 3.61% | 3.53% | 3.54% |
Allowance For Doubtful Accounts [Member] |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |
Balance at beginning of period | $ 73 | $ 56 | $ 54 |
Additions charged to income | 26 | 28 | 34 |
Additions charged to other accounts | 0 | 0 | 3 |
Deductions | 30 | 13 | 35 |
Balance at end of period | 69 | 73 | 56 |
PPL Electric Utilities Corp [Member] |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |
Operating Revenues | 2,402 | 2,331 | 2,358 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 21 | 40 |  |
Total Cash, Cash Equivalents and Restricted Cash | 21 | 40 | 264 | 269
Property, Plant and Equipment (Numeric) [Abstract] |  |  |  |
Interest costs, capitalized during the period | $ 6 | 7 | $ 8 |
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) | (9) |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 61 | 59 |  |
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 | $ 61 | $ 59 |  |
PPL Electric Utilities Corp [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |
Weighted-average rates | 3.05% | 2.99% | 3.05% |
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |
Balance at beginning of period | $ 41 | $ 28 | $ 27 |
Additions charged to income | 13 | 19 | 26 |
Additions charged to other accounts | 0 | 0 | 0 |
Deductions | 19 | 8 | 25 |
Balance at end of period | 35 | 41 | 28 |
Louisville Gas And Electric Co [Member] |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |
Operating Revenues | 1,569 | 1,456 | 1,500 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | $ 9 | 7 | $ 15 | 10
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 | (1) |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 137 | 119 |  |
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 | 32 | 38 |  |
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 | 54 | 30 |  |
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 | $ 51 |  |
Louisville Gas And Electric Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |
Weighted-average rates | 3.99% | 4.00% | 3.87% |
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |
Balance at beginning of period | $ 3 | $ 1 | $ 1 |
Additions charged to income | 4 | 4 | 2 |
Additions charged to other accounts | 0 | 0 | 2 |
Deductions | 4 | 2 | 4 |
Balance at end of period | 3 | 3 | 1 |
Kentucky Utilities Co [Member] |  |  |  |
Utility Revenue (Details) [Abstract] |  |  |  |
Operating Revenues | 1,826 | 1,690 | 1,740 |
Restricted Cash and Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | $ 13 | 22 | $ 12 | $ 14
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 | (5) |  |
Fuel, Materials and Supplies (Details) [Abstract] |  |  |  |
Fuel, materials and supplies on the Balance Sheet | 124 | 123 |  |
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 | 58 | 57 |  |
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 | $ 66 |  |
Kentucky Utilities Co [Member] | Regulated Operations [Member] | Utility Plant [Member] |  |  |  |
Depreciation (Details) [Abstract] |  |  |  |
Weighted-average rates | 4.17% | 4.00% | 4.02% |
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |
Allowance for Doubtful Accounts (Details) [Roll Forward] |  |  |  |
Balance at beginning of period | $ 2 | $ 1 | $ 2 |
Additions charged to income | 8 | 4 | 4 |
Additions charged to other accounts | 0 | 0 | 1 |
Deductions | 7 | 3 | 6 |
Balance at end of period | $ 3 | $ 2 | $ 1 |

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