Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Reform [Line Items]
Income Tax Expense (Benefit)	$ 458	$ 784	$ 648
Net Increase in Regulatory Liability	(13)	12	59
Deferred Tax Liabilities, Net	2,768	2,438
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	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
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Income Tax Expense (Benefit)	321
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Deemed Dividend [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	397
Income Tax Expense (Benefit)	139
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(67)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(330)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Foreign Tax Credit [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(157)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	110
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	229
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Income Tax Expense (Benefit)	321
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Deemed Dividend [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	462
Income Tax Expense (Benefit)	161
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(462)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Foreign Tax Credit [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(205)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	145
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	220
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Income Tax Expense (Benefit)	0
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Deemed Dividend [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(65)
Income Tax Expense (Benefit)	(22)
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(67)
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	132
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Foreign Tax Credit [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	48
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(35)
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	9
PPL Electric Utilities Corp [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	136	213	212
Net Increase in Regulatory Liability	19	5	62
Deferred Tax Liabilities, Net	1,320	1,154
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	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)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(107)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(39)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(68)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(13)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(105)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(105)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(13)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(2)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(39)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	37
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	0
LG And E And KU Energy LLC [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	129	375	257
Net Increase in Regulatory Liability	(32)	7	(1)
Deferred Tax Liabilities, Net	956	866
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	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
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(60)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(28)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(32)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	110
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(45)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(45)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	112
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(15)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(28)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	13
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	(2)
Louisville Gas And Electric Co [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	64	131	126
Net Increase in Regulatory Liability	(5)	5	1
Deferred Tax Liabilities, Net	628	572
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	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
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(17)
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	17
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(17)
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	17
Kentucky Utilities Co [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	76	159	163
Net Increase in Regulatory Liability	(27)	2	$ (2)
Deferred Tax Liabilities, Net	735	691
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	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
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(11)
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	11
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	(11)
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)	$ 11