Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Before Income Taxes (Details) [Abstract]
Domestic income	$ 964	$ 1,127	$ 874
Foreign income	1,191	1,158	1,038
Income Before Income Taxes	2,155	2,285	1,912
Deferred Tax Assets
Deferred investment tax credits	31	31
Regulatory liabilities	75	87
Income taxes due to customer	462	479
Accrued pension and postretirement costs	211	277
Federal loss carryforwards	324	325
State loss carryforwards	432	419
Federal and state tax credit carryforwards	402	392
Foreign capital loss carryforwards	320	313
Foreign - other	8	10
Contributions in aid of construction	112	139
Domestic - other	99	88
Valuation allowances	(834)	(808)
Total deferred tax assets	1,642	1,752
Deferred Tax Liabilities
Domestic plant - net	3,546	3,359
Regulatory assets	262	314
Foreign plant - net	765	724
Foreign - pensions	72	83
Domestic - other	61	40
Total deferred tax liabilities	4,706	4,520
Net deferred tax liability	3,064	2,768
Loss carryforwards
Federal loss carryforwards	324	325
State loss carryforwards	432	419
Foreign capital loss carryforwards	320	313
Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	315
Loss carryforwards
Net operating losses	1,499
Charitable contributions	42
Federal loss carryforwards	315
Charitable contribution carryforwards	9
Other Federal Loss Carryforwards	1
Loss carryforward valuation allowance on net operating losses	0
Charitable Contributions Loss Carryforwards valuation allowance	0
Other Loss Carryforward	7
Loss Carryforward Valuation Allowance Other	0
State [Member]
Deferred Tax Assets
State loss carryforwards	432
Loss carryforwards
Net operating losses	5,879
Charitable contributions	1
State loss carryforwards	432
Charitable contribution carryforwards	0
Loss carryforward valuation allowance on net operating losses	(393)
Charitable Contributions Loss Carryforwards valuation allowance	0
Foreign Tax Authority [Member]
Deferred Tax Assets
Foreign capital loss carryforwards	320
Foreign loss carryforwards	0
Loss carryforwards
Net operating losses	3
Capital losses	1,880
Foreign loss carryforwards	0
Foreign capital loss carryforwards	320
Loss carryforward valuation allowance on net operating losses	0
Loss carryforward valuation allowance on capital losses	(320)
Tax Cuts And Jobs Act [Member]
Deferred Tax Liabilities
Net deferred tax liability			101
Other Noncurrent Assets [Member]
Deferred Tax Liabilities
Deferred Tax Assets, State Taxes	24	28
PPL Electric Utilities Corp [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	606	566	575
Deferred Tax Assets
Regulatory liabilities	31	35
Income taxes due to customer	170	181
Accrued pension and postretirement costs	81	110
Federal loss carryforwards	78	79
State loss carryforwards	6	14
Contributions in aid of construction	88	118
Domestic - other	23	25
Total deferred tax assets	477	562
Deferred Tax Liabilities
Domestic plant - net	1,761	1,681
Regulatory assets	139	176
Domestic - other	24	25
Total deferred tax liabilities	1,924	1,882
Net deferred tax liability	1,447	1,320
Loss carryforwards
Federal loss carryforwards	78	79
State loss carryforwards	6	14
PPL Electric Utilities Corp [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	76
Loss carryforwards
Net operating losses	363
Charitable contributions	9
Federal loss carryforwards	76
Charitable contribution carryforwards	2
PPL Electric Utilities Corp [Member] | State [Member]
Deferred Tax Assets
State loss carryforwards	6
Loss carryforwards
Net operating losses	81
State loss carryforwards	6
LG And E And KU Energy LLC [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	571	574	691
Deferred Tax Assets
Deferred investment tax credits	31	32
Regulatory liabilities	44	52
Income taxes due to customer	292	299
Deferred Tax Assets, Lease Liabilities	14	0
Accrued pension and postretirement costs	71	92
State tax credit carryforwards	19	1
Federal loss carryforwards	140	142
State loss carryforwards	31	33
Federal and state tax credit carryforwards	162	169
Contributions in aid of construction	23	21
Domestic - other	28	28
Valuation allowances	(6)	(8)
Total deferred tax assets	849	861
Deferred Tax Liabilities
Domestic plant - net	1,778	1,671
Regulatory assets	122	138
Lease right-of-use assets	12	0
Domestic - other	6	8
Total deferred tax liabilities	1,918	1,817
Net deferred tax liability	1,069	956
Loss carryforwards
Federal loss carryforwards	140	142
State loss carryforwards	31	33
LG And E And KU Energy LLC [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	140
Loss carryforwards
Net operating losses	668
Charitable contributions	23
Federal loss carryforwards	140
Charitable contribution carryforwards	5
Loss carryforward valuation allowance on net operating losses	0
Charitable Contributions Loss Carryforwards valuation allowance	0
LG And E And KU Energy LLC [Member] | State [Member]
Deferred Tax Assets
State loss carryforwards	31
Loss carryforwards
Net operating losses	797
State loss carryforwards	31
Loss carryforward valuation allowance on net operating losses	0
Louisville Gas And Electric Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	295	297	344
Deferred Tax Assets
Deferred investment tax credits	8	9
Regulatory liabilities	19	24
Income taxes due to customer	136	139
Deferred Tax Assets, Lease Liabilities	5	0
Accrued pension and postretirement costs	6	16
State tax credit carryforwards	14	0
Contributions in aid of construction	15	14
Domestic - other	10	15
Valuation allowances	(14)	0
Total deferred tax assets	199	217
Deferred Tax Liabilities
Domestic plant - net	811	751
Regulatory assets	77	88
Lease right-of-use assets	4	0
Domestic - other	4	6
Total deferred tax liabilities	896	845
Net deferred tax liability	697	628
Kentucky Utilities Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	372	362	$ 418
Deferred Tax Assets
Deferred investment tax credits	23	23
Regulatory liabilities	25	28
Income taxes due to customer	156	160
Deferred Tax Assets, Lease Liabilities	8	0
Accrued pension and postretirement costs	0	7
State tax credit carryforwards	5	0
Contributions in aid of construction	8	7
Domestic - other	3	3
Valuation allowances	(4)	0
Total deferred tax assets	224	228
Deferred Tax Liabilities
Domestic plant - net	959	911
Regulatory assets	45	50
Accrued pension and postretirement costs	2	0
Lease right-of-use assets	7	0
Domestic - other	3	2
Total deferred tax liabilities	1,016	963
Net deferred tax liability	$ 792	$ 735