Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Credit carryforwards
Deferred tax asset credit carryforwards	$ 401	$ 402
Deferred Tax Assets, Valuation Allowances	906	834
Tax Cuts And Jobs Act [Member]
Credit carryforwards
Permanently reinvested cumulative undistributed foreign earnings	8,000
Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	134
Credit Carryforward Valuation Allowance Investment Tax Credit	0
Foreign Tax Credit [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	218
Credit Carryforward Valuation Allowance Foreign Tax Credits	(113)
Foreign Tax Credit [Member] | Federal [Member] | Tax Year 2016 [Member] | Tax Cuts And Jobs Act [Member]
Credit carryforwards
Deferred Tax Assets, Foreign Tax Credit Carryforwards	62
Foreign Tax Credit [Member] | Federal [Member] | Tax Year 2017 [Member] | Tax Cuts And Jobs Act [Member]
Credit carryforwards
Deferred Tax Assets, Foreign Tax Credit Carryforwards	156
Recycling Tax Credit [Member] | State [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	16
Credit Carryforward Valuation Allowance Other	0
Other [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	32
Credit Carryforward Valuation Allowance Other	(4)
Other [Member] | State [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	1
Credit Carryforward Valuation Allowance Other	0
Valuation Allowance Of Deferred Tax Assets [Member]
Valuation Allowances and Reserves (Details) [Roll Forward]
Balance at beginning of period	834	808	$ 838
Additions charged to income	69	31	26
Additions charged to other accounts	7	0	0
Deductions	4	5	56
Balance at end of period	906	834	808
Decrease of the valuation allowance as a result of a change in foreign tax credits available			35
Decrease of the valuation allowance as a result of the change in currency exchange rates	11		19
Increase of the valuation allowance as a result of the reduction in the U.S. federal corporate income tax rate	38
PPL Electric Utilities Corp [Member] | Other [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	5
LG And E And KU Energy LLC [Member]
Credit carryforwards
State tax credit carryforwards	17	19
Deferred tax asset credit carryforwards	159	162
Deferred Tax Assets, Valuation Allowances	4	6
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	134
Credit Carryforward Valuation Allowance Investment Tax Credit	0
LG And E And KU Energy LLC [Member] | Recycling Tax Credit [Member] | State [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	16
Credit Carryforward Valuation Allowance Other	0
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	25
Credit Carryforward Valuation Allowance Other	(4)
LG And E And KU Energy LLC [Member] | Other [Member] | State [Member]
Credit carryforwards
Deferred tax asset credit carryforwards	1
Credit Carryforward Valuation Allowance Other	0
LG And E And KU Energy LLC [Member] | Valuation Allowance Of Deferred Tax Assets [Member]
Valuation Allowances and Reserves (Details) [Roll Forward]
Balance at beginning of period	6	8	8
Additions charged to other accounts	0	3	0
Deductions	2	5	0
Balance at end of period	4	6	$ 8
Louisville Gas And Electric Co [Member]
Credit carryforwards
State tax credit carryforwards	12	14
Deferred Tax Assets, Valuation Allowances	12	14
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	12
Deferred Tax Assets, Valuation Allowances	12
Kentucky Utilities Co [Member]
Credit carryforwards
State tax credit carryforwards	5	5
Deferred Tax Assets, Valuation Allowances	4	$ 4
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member]
Credit carryforwards
State tax credit carryforwards	5
Deferred Tax Assets, Valuation Allowances	4
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member]
Credit carryforwards
State tax credit carryforwards	4
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Indefinite [Member]
Credit carryforwards
State tax credit carryforwards	$ 1