Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Goodwill	$ 3,086		$ 3,198
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	1,278		815
Restricted Cash, Current	3		3
Restricted Cash, Noncurrent	20		18
Cash, Cash Equivalents and Restricted Cash	1,301		836	$ 428	$ 643
U.K. Regulated [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	2,400	$ 2,500	2,500
Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	38		30
Charged to Income	15
Deductions	7
Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	27		27
Charged to Income	1
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	13		262
Restricted Cash, Current	2		2
Restricted Cash, Noncurrent	0		0
Cash, Cash Equivalents and Restricted Cash	15		264	22	269
PPL Electric Utilities Corp [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	31		25
Charged to Income	9
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	152		27	32	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	3
Deductions	3
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	5		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	145		12	$ 23	$ 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	2
Deductions	$ 2