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v3.20.1

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill | $ 3,178 | $ 3,198 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |
Cash and cash equivalents | 915 | 815 |  |
Restricted Cash, Current | 3 | 3 |  |
Restricted Cash, Noncurrent | 18 | 18 |  |
Cash, Cash Equivalents and Restricted Cash | 936 | 836 | $ 540 | $ 643
U.K. Regulated [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Goodwill | 2,500 | 2,500 |  |
Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 34 | 30 |  |
Charged to Income | 9 |  |  |
Deductions | 5 |  |  |
Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 26 | 27 |  |
Charged to Income | 0 |  |  |
Deductions | 1 |  |  |
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 | 33 | 262 |  |
Restricted Cash, Current | 2 | 2 |  |
Restricted Cash, Noncurrent | 0 | 0 |  |
Cash, Cash Equivalents and Restricted Cash | 35 | 264 | 25 | 269
PPL Electric Utilities Corp [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 28 | 25 |  |
Charged to Income | 5 |  |  |
Deductions | 2 |  |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 1 | 1 |  |
Charged to Income | 0 |  |  |
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 | 47 | 27 | 22 | 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 | 2 | 2 |  |
Charged to Income | 2 |  |  |
Deductions | 2 |  |  |
LG And E And KU Energy LLC [Member] | Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 25 | 26 |  |
Charged to Income | 0 |  |  |
Deductions | 1 |  |  |
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 | 7 | 15 | 9 | 10
Louisville Gas And Electric Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 1 | 1 |  |
Charged to Income | 1 |  |  |
Deductions | 1 |  |  |
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 | 40 | 12 | $ 13 | $ 14
Kentucky Utilities Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Balance | 1 | $ 1 |  |
Charged to Income | 1 |  |  |
Deductions | $ 1 |  |  |

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