Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Goodwill		$ 716	$ 716
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents		4,767	442
Restricted Cash, Current		1	1
Cash, Cash Equivalents and Restricted Cash		4,768	443	$ 504	$ 660
Cash, Cash Equivalents and Restricted Cash			443
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
Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		36	44
Charged to Income		9
Deductions		17
Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		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		59	40
Cash, Cash Equivalents and Restricted Cash		59	40	28	264
PPL Electric Utilities Corp [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		32	39
Charged to Income		4
Deductions		11
PPL Electric Utilities Corp [Member] | Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		1	1
Charged to Income		0
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		5	7	10	15
Louisville Gas And Electric Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		2	3
Charged to Income		1
Deductions		2
Louisville Gas And Electric Co [Member] | Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		1	0
Charged to Income		1
Deductions		0
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		8	22	$ 15	$ 12
Kentucky Utilities Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance		2	$ 2
Charged to Income		4
Deductions		$ 4