Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Before Income Taxes (Details) [Abstract]
Domestic income	$ 1,127	$ 874	$ 1,463
Foreign income	1,158	1,038	1,087
Income Before Income Taxes	2,285	1,912	2,550
Deferred Tax Assets
Deferred investment tax credits	31	33
Regulatory liabilities	87	68
Income taxes due to customer	479	499
Accrued pension and postretirement costs	277	232
Federal loss carryforwards	325	356
State loss carryforwards	419	409
Federal and state tax credit carryforwards	392	455
Foreign capital loss carryforwards	313	329
Foreign loss carryforwards	1	2
Foreign - regulatory obligations	0	2
Foreign - other	9	7
Contributions in aid of construction	139	134
Domestic - other	81	102
Unrealized losses on qualifying derivatives	7	10
Valuation allowances	(808)	(838)
Total deferred tax assets	1,752	1,800
Deferred Tax Liabilities
Domestic plant - net	3,359	3,168
Regulatory assets	314	288
Reacquired debt costs	12	15
Foreign plant - net	724	726
Foreign - pensions	83	32
Domestic - other	28	9
Total deferred tax liabilities	4,520	4,238
Net deferred tax liability	2,768	2,438
Loss carryforwards
Federal loss carryforwards	325	356
State loss carryforwards	419	409
Foreign loss carryforwards	1	2
Foreign capital loss carryforwards	313	329
Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	319
Loss carryforwards
Net operating losses	1,519
Charitable contributions	29
Federal loss carryforwards	319
Charitable contribution carryforwards	6
Loss carryforward valuation allowance on net operating losses	0
Charitable Contributions Loss Carryforwards valuation allowance	0
State [Member]
Deferred Tax Assets
State loss carryforwards	418
Loss carryforwards
Net operating losses	5,725
Charitable contributions	7
State loss carryforwards	418
Charitable contribution carryforwards	1
Loss carryforward valuation allowance on net operating losses	(370)
Charitable Contributions Loss Carryforwards valuation allowance	0
Foreign Tax Authority [Member]
Deferred Tax Assets
Foreign capital loss carryforwards	313
Foreign loss carryforwards	1
Loss carryforwards
Net operating losses	6
Capital losses	1,842
Foreign loss carryforwards	1
Foreign capital loss carryforwards	313
Loss carryforward valuation allowance on net operating losses	0
Loss carryforward valuation allowance on capital losses	(313)
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	$ 28	24
Minimum [Member] | Federal [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2031
Expiration - charitable contributions	Dec. 31, 2020
Minimum [Member] | State [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2019
Expiration - charitable contributions	Dec. 31, 2020
Maximum [Member] | Federal [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2037
Expiration - charitable contributions	Dec. 31, 2022
Maximum [Member] | State [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2038
Expiration - charitable contributions	Dec. 31, 2022
PPL Electric Utilities Corp [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	$ 566	575	552
Deferred Tax Assets
Regulatory liabilities	35	25
Income taxes due to customer	181	193
Accrued pension and postretirement costs	110	81
Federal loss carryforwards	79	91
State loss carryforwards	14	19
Contributions in aid of construction	118	117
Domestic - other	25	27
Total deferred tax assets	562	553
Deferred Tax Liabilities
Domestic plant - net	1,681	1,544
Regulatory assets	176	150
Reacquired debt costs	6	8
Domestic - other	19	5
Total deferred tax liabilities	1,882	1,707
Net deferred tax liability	1,320	1,154
Loss carryforwards
Federal loss carryforwards	79	91
State loss carryforwards	14	19
PPL Electric Utilities Corp [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	78
Loss carryforwards
Net operating losses	370
Charitable contributions	6
Federal loss carryforwards	78
Charitable contribution carryforwards	1
PPL Electric Utilities Corp [Member] | State [Member]
Deferred Tax Assets
State loss carryforwards	14
Loss carryforwards
Net operating losses	180
Charitable contributions	5
State loss carryforwards	14
Charitable contribution carryforwards	$ 0
PPL Electric Utilities Corp [Member] | Minimum [Member] | Federal [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2031
Expiration - charitable contributions	Dec. 31, 2020
PPL Electric Utilities Corp [Member] | Minimum [Member] | State [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2031
Expiration - charitable contributions	Dec. 31, 2020
PPL Electric Utilities Corp [Member] | Maximum [Member] | Federal [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2037
Expiration - charitable contributions	Dec. 31, 2022
PPL Electric Utilities Corp [Member] | Maximum [Member] | State [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2032
Expiration - charitable contributions	Dec. 31, 2022
LG And E And KU Energy LLC [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	$ 574	691	686
Deferred Tax Assets
Deferred investment tax credits	32	33
Regulatory liabilities	52	43
Income taxes due to customer	299	305
Accrued pension and postretirement costs	92	100
Federal loss carryforwards	142	150
State loss carryforwards	33	41
Federal and state tax credit carryforwards	169	181
Contributions in aid of construction	21	17
Domestic - other	29	33
Valuation allowances	(8)	(8)
Total deferred tax assets	861	895
Deferred Tax Liabilities
Domestic plant - net	1,671	1,615
Regulatory assets	138	138
Domestic - other	8	8
Total deferred tax liabilities	1,817	1,761
Net deferred tax liability	956	866
Loss carryforwards
Federal loss carryforwards	142	150
State loss carryforwards	33	41
LG And E And KU Energy LLC [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards	142
Loss carryforwards
Net operating losses	674
Charitable contributions	11
Federal loss carryforwards	142
Charitable contribution carryforwards	2
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	33
Loss carryforwards
Net operating losses	848
State loss carryforwards	33
Loss carryforward valuation allowance on net operating losses	$ 0
LG And E And KU Energy LLC [Member] | Minimum [Member] | Federal [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2031
Expiration - charitable contributions	Dec. 31, 2020
LG And E And KU Energy LLC [Member] | Minimum [Member] | State [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2029
LG And E And KU Energy LLC [Member] | Maximum [Member] | Federal [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2037
Expiration - charitable contributions	Dec. 31, 2022
LG And E And KU Energy LLC [Member] | Maximum [Member] | State [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2038
Louisville Gas And Electric Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	$ 297	344	329
Deferred Tax Assets
Deferred investment tax credits	9	9
Regulatory liabilities	24	21
Income taxes due to customer	139	142
Accrued pension and postretirement costs	16	14
Federal loss carryforwards	0	29
Contributions in aid of construction	14	11
Domestic - other	15	19
Total deferred tax assets	217	245
Deferred Tax Liabilities
Domestic plant - net	751	724
Regulatory assets	88	88
Domestic - other	6	5
Total deferred tax liabilities	845	817
Net deferred tax liability	628	572
Loss carryforwards
Federal loss carryforwards	0	29
Kentucky Utilities Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income Before Income Taxes	362	418	$ 428
Deferred Tax Assets
Deferred investment tax credits	23	24
Regulatory liabilities	28	22
Income taxes due to customer	160	163
Accrued pension and postretirement costs	7	7
Federal loss carryforwards	0	13
Contributions in aid of construction	7	6
Domestic - other	3	8
Total deferred tax assets	228	243
Deferred Tax Liabilities
Domestic plant - net	911	882
Regulatory assets	50	50
Domestic - other	2	2
Total deferred tax liabilities	963	934
Net deferred tax liability	735	691
Loss carryforwards
Federal loss carryforwards	$ 0	$ 13