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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | $ 716 | $ 716 | $ 716 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 7,629 | 7,629 | 442 |  |
Restricted Cash, Current | 1 | 1 | 1 |  |
Cash, Cash Equivalents and Restricted Cash | 7,630 | 7,630 | 443 | $ 1,145 | $ 660
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Asset Impairment Charges | 37 |  |  |  |
Asset Impairment Impairment Charges (After-Tax) | 28 |  |  |  |
Financing Receivable, Allowance for Credit Loss [Table] |  |  |  |  |
Solar Panel Inventory | 49 | 49 |  |  |
Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 42 | 42 | 44 |  |
Charged to Income |  | 2 |  |  |
Deductions |  | 4 |  |  |
Other [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 29 | 29 | 28 |  |
Charged to Income |  | 1 |  |  |
Deductions |  | 0 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 58 | 58 | 40 |  |
Cash, Cash Equivalents and Restricted Cash | 58 | 58 | 40 | 15 | 264
PPL Electric Utilities Corp [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 38 | 38 | 39 |  |
Charged to Income |  | 1 |  |  |
Deductions |  | 2 |  |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 1 | 1 | 1 |  |
Charged to Income |  | 0 |  |  |
Deductions |  | 0 |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | 389 | 389 | 389 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 4 | 4 | 7 | 5 | 15
Louisville Gas And Electric Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 2 | 2 | 3 |  |
Charged to Income |  | 0 |  |  |
Deductions |  | 1 |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | 607 | 607 | 607 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 7 | 7 | 22 | $ 145 | $ 12
Kentucky Utilities Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | $ 2 | 2 | $ 2 |  |
Charged to Income |  | 1 |  |  |
Deductions |  | $ 1 |  |  |

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