Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax Reform [Line Items]
Income Tax Expense (Benefit)	$ 784	$ 648	$ 465
Net Increase in Regulatory Liability	12	59	(42)
Deferred Tax Liabilities, Net	2,438	3,862
Tax Cuts And Jobs Act [Member]
Tax Reform [Line Items]
Taxable Deemed Dividend	462
Income Tax Expense (Benefit)	321
Net Increase in Regulatory Liability	2,185
Deferred Tax Liabilities, Net	101
Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	220
PPL Electric Utilities Corp [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	213	212	164
Net Increase in Regulatory Liability	5	62	(35)
Deferred Tax Liabilities, Net	1,154	1,899
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(13)
Net Increase in Regulatory Liability	1,019
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(13)
LG And E And KU Energy LLC [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	375	257	239
Deferred Tax Liabilities, Net	866	1,735
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	112
Net Increase in Regulatory Liability	1,166
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	112
Louisville Gas And Electric Co [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	131	126	114
Deferred Tax Liabilities, Net	572	974
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	0
Net Increase in Regulatory Liability	532
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	0
Kentucky Utilities Co [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	159	163	$ 140
Deferred Tax Liabilities, Net	691	$ 1,170
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	0
Net Increase in Regulatory Liability	634
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	$ 0