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