Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Before Income Taxes (Details) [Abstract]
Domestic income	$ 902	$ 964	$ 1,127
Foreign income	1,069	1,191	1,158
Income Before Income Taxes	1,971	2,155	2,285
Deferred Tax Assets
Deferred investment tax credits	30	31
Regulatory liabilities	68	75
Income taxes due to customer	444	462
Accrued pension and postretirement costs	106	211
Federal loss carryforwards	234	324
State loss carryforwards	448	432
Foreign capital loss carryforwards	370	320
Foreign - other	6	8
Contributions in aid of construction	115	112
Domestic - other	136	99
Valuation allowances	(906)	(834)
Total deferred tax assets	1,452	1,642
Deferred Tax Liabilities
Domestic plant - net	3,700	3,546
Regulatory assets	195	262
Foreign plant - net	911	765
Foreign - pensions	127	72
Domestic - other	70	61
Total deferred tax liabilities	5,003	4,706
Net deferred tax liability	3,551	3,064
Loss carryforwards
Federal loss carryforwards	234	324
State loss carryforwards	448	432
Foreign capital loss carryforwards	370	320
Deferred tax asset credit carryforwards	401	402
Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	234
Loss carryforwards
Net operating losses	1,111
Federal loss carryforwards	234
Other Federal Loss Carryforwards	2
Loss carryforward valuation allowance on net operating losses	0
Other Loss Carryforward	13
Loss Carryforward Valuation Allowance Other	0
Federal [Member] | General Business Tax Credit Carryforward [Member]
Loss carryforwards
Deferred tax asset credit carryforwards	32
State [Member]
Deferred Tax Assets
State loss carryforwards	448
Loss carryforwards
Net operating losses	6,032
State loss carryforwards	448
Other Federal Loss Carryforwards	0
Loss carryforward valuation allowance on net operating losses	(419)
Other Loss Carryforward	2
Loss Carryforward Valuation Allowance Other	0
State [Member] | General Business Tax Credit Carryforward [Member]
Loss carryforwards
Deferred tax asset credit carryforwards	1
Foreign Tax Authority [Member]
Deferred Tax Assets
Foreign capital loss carryforwards	370
Loss carryforwards
Capital losses	1,945
Foreign capital loss carryforwards	370
Loss carryforward valuation allowance on capital losses	(370)
Deferred Tax Assets, Capital Loss Carryforwards, U.K. Finance Act 2020	106
Other Noncurrent Assets [Member]
Deferred Tax Liabilities
Deferred Tax Assets, State Taxes	17	24
PPL Electric Utilities Corp [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	664	606	566
Deferred Tax Assets
Regulatory liabilities	24	31
Income taxes due to customer	162	170
Accrued pension and postretirement costs	25	81
Federal loss carryforwards	52	78
State loss carryforwards	0	6
Contributions in aid of construction	91	88
Domestic - other	29	23
Total deferred tax assets	383	477
Deferred Tax Liabilities
Domestic plant - net	1,826	1,761
Regulatory assets	86	139
Domestic - other	30	24
Total deferred tax liabilities	1,942	1,924
Net deferred tax liability	1,559	1,447
Loss carryforwards
Federal loss carryforwards	52	78
State loss carryforwards	0	6
PPL Electric Utilities Corp [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	52
Loss carryforwards
Net operating losses	248
Federal loss carryforwards	52
PPL Electric Utilities Corp [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member]
Loss carryforwards
Deferred tax asset credit carryforwards	5
LG And E And KU Energy LLC [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	556	571	574
Deferred Tax Assets
Deferred investment tax credits	30	31
Regulatory liabilities	43	44
Income taxes due to customer	282	292
Deferred Tax Assets, Lease Liabilities	13	14
Accrued pension and postretirement costs	57	71
State tax credit carryforwards	17	19
Federal loss carryforwards	107	140
State loss carryforwards	28	31
Contributions in aid of construction	23	23
Domestic - other	29	28
Valuation allowances	(4)	(6)
Total deferred tax assets	784	849
Deferred Tax Liabilities
Domestic plant - net	1,831	1,778
Regulatory assets	109	122
Lease right-of-use assets	11	12
Domestic - other	8	6
Total deferred tax liabilities	1,959	1,918
Net deferred tax liability	1,175	1,069
Loss carryforwards
Federal loss carryforwards	107	140
State loss carryforwards	28	31
Deferred tax asset credit carryforwards	159	162
LG And E And KU Energy LLC [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	107
Loss carryforwards
Net operating losses	511
Charitable contributions	1
Federal loss carryforwards	107
Charitable contribution carryforwards	0
Loss carryforward valuation allowance on net operating losses	0
Charitable Contributions Loss Carryforwards valuation allowance	0
LG And E And KU Energy LLC [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member]
Loss carryforwards
Deferred tax asset credit carryforwards	25
LG And E And KU Energy LLC [Member] | State [Member]
Deferred Tax Assets
State loss carryforwards	28
Loss carryforwards
Net operating losses	710
State loss carryforwards	28
Loss carryforward valuation allowance on net operating losses	0
LG And E And KU Energy LLC [Member] | State [Member] | General Business Tax Credit Carryforward [Member]
Loss carryforwards
Deferred tax asset credit carryforwards	1
Louisville Gas And Electric Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	306	295	297
Deferred Tax Assets
Deferred investment tax credits	8	8
Regulatory liabilities	20	19
Income taxes due to customer	132	136
Deferred Tax Assets, Lease Liabilities	5	5
Accrued pension and postretirement costs	0	6
State tax credit carryforwards	12	14
Contributions in aid of construction	15	15
Domestic - other	11	10
Valuation allowances	(12)	(14)
Total deferred tax assets	191	199
Deferred Tax Liabilities
Domestic plant - net	833	811
Regulatory assets	66	77
Lease right-of-use assets	4	4
Domestic - other	4	4
Total deferred tax liabilities	907	896
Net deferred tax liability	716	697
Louisville Gas And Electric Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member]
Deferred Tax Assets
State tax credit carryforwards	12
Valuation allowances	(12)
Kentucky Utilities Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	343	372	$ 362
Deferred Tax Assets
Deferred investment tax credits	22	23
Regulatory liabilities	23	25
Income taxes due to customer	150	156
Deferred Tax Assets, Lease Liabilities	8	8
State tax credit carryforwards	5	5
Contributions in aid of construction	8	8
Domestic - other	4	3
Valuation allowances	(4)	(4)
Total deferred tax assets	216	224
Deferred Tax Liabilities
Domestic plant - net	992	959
Regulatory assets	43	45
Accrued pension and postretirement costs	8	2
Lease right-of-use assets	7	7
Domestic - other	1	3
Total deferred tax liabilities	1,051	1,016
Net deferred tax liability	835	$ 792
Kentucky Utilities Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member]
Deferred Tax Assets
State tax credit carryforwards	5
Valuation allowances	$ (4)