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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 31, 2021 | Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Asset Impairment Charges | $ 37 |  |  |  |  |
Asset Impairment Impairment Charges (After-Tax) | $ 28 |  |  |  |  |
Solar Panel Inventory |  | $ 32 |  |  |  |
Other |  | 58 | $ 86 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  |  | 2 |  |  |
Debt Instrument, Redemption, Period One [Member] | Senior Notes Due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.375% |
Principal amount |  |  |  |  | $ 250 |
Debt Instrument, Redemption, Period One [Member] | LKE [Member] | Senior Notes Due 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.375% |
Principal amount |  |  |  |  | $ 250 |
Allowance For Doubtful Accounts [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 69 | 73 | $ 56 |  | $ 54
Additions charged to income |  | 26 | 28 | 34 |  |
Additions charged to other accounts |  | 0 | 0 | 3 |  |
Deductions |  | 30 | 13 | 35 |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Adjusted for CECL, Amount |  |  |  | 58 |  |
Other |  | 32 | 30 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Other |  | 22 | 17 |  |  |
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 35 | 41 | 28 |  | $ 27
Additions charged to income |  | 13 | 19 | 26 |  |
Additions charged to other accounts |  | 0 | 0 | 0 |  |
Deductions |  | 19 | 8 | 25 |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Adjusted for CECL, Amount |  |  |  | $ 30 |  |
Other |  | $ 3 | $ 3 |  |  |

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