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