Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	$ 406		$ 621
Restricted Cash, Current	3		3
Restricted Cash, Noncurrent	19		19
Cash, Cash Equivalents and Restricted Cash	428		643	$ 875	$ 511
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	74	$ 81
Lease Liability - Current	20	23
Lease Liability - Noncurrent	62	67
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	20		267
Restricted Cash, Current	2		2
Restricted Cash, Noncurrent	0		0
Cash, Cash Equivalents and Restricted Cash	22		269	491	51
LG And E And KU Energy LLC [Member]
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	32		24	39	30
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	50	56
Lease Liability - Current	16	18
Lease Liability - Noncurrent	42	46
Louisville Gas And Electric Co [Member]
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	9		10	19	15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	19	23
Lease Liability - Current	6	9
Lease Liability - Noncurrent	17	18
Kentucky Utilities Co [Member]
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	23		$ 14	$ 20	$ 15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of Use Asset	29	31
Lease Liability - Current	9	9
Lease Liability - Noncurrent	$ 24	$ 26