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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | $ 3,283 |  | $ 3,198 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 746 |  | 815 |  |
Restricted Cash, Current | 3 |  | 3 |  |
Restricted Cash, Noncurrent | 20 |  | 18 |  |
Cash, Cash Equivalents and Restricted Cash | 769 |  | 836 | $ 690 | $ 643
U.K. Regulated [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | 2,600 | $ 2,500 | 2,500 |  |
Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 43 |  | 30 |  |
Charged to Income | 22 |  |  |  |
Deductions | 9 |  |  |  |
Other [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 29 |  | 27 |  |
Charged to Income | 2 |  |  |  |
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 | 26 |  | 262 |  |
Restricted Cash, Current | 2 |  | 2 |  |
Restricted Cash, Noncurrent | 0 |  | 0 |  |
Cash, Cash Equivalents and Restricted Cash | 28 |  | 264 | 29 | 269
PPL Electric Utilities Corp [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 34 |  | 25 |  |
Charged to Income | 12 |  |  |  |
Deductions | 3 |  |  |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 2 |  | 1 |  |
Charged to Income | 1 |  |  |  |
Deductions | 0 |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | 996 |  | 996 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 25 |  | 27 | 30 | 24
LG And E And KU Energy LLC [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 4 |  | 2 |  |
Charged to Income | 7 |  |  |  |
Deductions | 5 |  |  |  |
LG And E And KU Energy LLC [Member] | Other [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 27 |  | 26 |  |
Charged to Income | 1 |  |  |  |
Deductions | 0 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | 389 |  | 389 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 10 |  | 15 | 12 | 10
Louisville Gas And Electric Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 2 |  | 1 |  |
Charged to Income | 4 |  |  |  |
Deductions | 3 |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | 607 |  | 607 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |
Cash and cash equivalents | 15 |  | 12 | $ 18 | $ 14
Kentucky Utilities Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Balance | 2 |  | $ 1 |  |
Charged to Income | 3 |  |  |  |
Deductions | $ 2 |  |  |  |

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