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Summary of Significant Accounting Policies (Details) - Allowance For Doubtful Accounts [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 75 | $ 58 | $ 56 | $ 51
Additions charged to income | 31 | 37 | 41 |
Additions charged to other accounts | 0 | 3 | 3 |
Deductions | 16 | 38 | 39 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Adjusted for CECL, Amount |  | 60 |  |
PPL Electric Utilities Corp [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 41 | 28 | 27 | $ 24
Additions charged to income | 19 | 26 | 29 |
Additions charged to other accounts | 0 | 0 | 0 |
Deductions | $ 8 | 25 | $ 26 |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Adjusted for CECL, Amount |  | $ 30 |  |

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