Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Before Income Taxes (Details) [Abstract]
Income (Loss) from Continuing Operations Before Income Taxes	$ 521	$ 954	$ 919
Deferred Tax Assets
Deferred investment tax credits	30	30
Regulatory liabilities	94	68
Income taxes due to customer	422	444
Accrued pension and postretirement costs	75	106
Federal loss carryforwards	0	234
State loss carryforwards	483	448
Deferred Tax Assets, Leases	67	68
Contributions in aid of construction	120	115
Leases	84	68
Valuation allowances	(462)	(536)
Total deferred tax assets	928	1,446
Deferred Tax Liabilities
Domestic plant - net	3,812	3,700
Regulatory assets	180	195
Domestic - other	75	70
Total deferred tax liabilities	4,067	3,965
Net deferred tax liability	3,139	2,519
Loss carryforwards
Federal loss carryforwards	0	234
State loss carryforwards	483	448
Deferred tax asset tax credit carryforwards	15	401
State [Member]
Deferred Tax Assets
State loss carryforwards	483
Loss carryforwards
Net operating losses	6,468
State loss carryforwards	483
Loss carryforward valuation allowance on net operating losses	(459)
State [Member] | General Business Tax Credit Carryforward [Member]
Loss carryforwards
Deferred tax asset tax credit carryforwards	1
Other Noncurrent Assets [Member]
Deferred Tax Liabilities
Deferred Tax Assets, State Taxes	12	17
PPL Electric Utilities Corp [Member]
Income Before Income Taxes (Details) [Abstract]
Income (Loss) from Continuing Operations Before Income Taxes	599	664	606
Deferred Tax Assets
Regulatory liabilities	52	24
Income taxes due to customer	154	162
Accrued pension and postretirement costs	14	25
Federal loss carryforwards	0	52
Contributions in aid of construction	95	91
Leases	21	29
Total deferred tax assets	336	383
Deferred Tax Liabilities
Domestic plant - net	1,891	1,826
Regulatory assets	74	86
Domestic - other	39	30
Total deferred tax liabilities	2,004	1,942
Net deferred tax liability	1,668	1,559
Loss carryforwards
Federal loss carryforwards	0	52
Louisville Gas And Electric Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income (Loss) from Continuing Operations Before Income Taxes	303	306	295
Deferred Tax Assets
Deferred investment tax credits	8	8
Regulatory liabilities	18	20
Income taxes due to customer	125	132
Deferred Tax Assets, Lease Liabilities	4	5
State tax credit carryforwards	11	12
Contributions in aid of construction	15	15
Leases	11	11
Valuation allowances	(11)	(12)
Total deferred tax assets	181	191
Deferred Tax Liabilities
Domestic plant - net	854	833
Regulatory assets	65	66
Lease right-of-use assets	4	4
Domestic - other	9	4
Total deferred tax liabilities	932	907
Net deferred tax liability	751	716
Louisville Gas And Electric Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member]
Deferred Tax Assets
State tax credit carryforwards	11
Valuation allowances	(11)
Kentucky Utilities Co [Member]
Income Before Income Taxes (Details) [Abstract]
Income (Loss) from Continuing Operations Before Income Taxes	363	343	$ 372
Deferred Tax Assets
Deferred investment tax credits	22	22
Regulatory liabilities	23	23
Income taxes due to customer	143	150
Deferred Tax Assets, Lease Liabilities	7	8
State tax credit carryforwards	4	5
Contributions in aid of construction	9	8
Leases	4	4
Valuation allowances	(3)	(4)
Total deferred tax assets	209	216
Deferred Tax Liabilities
Domestic plant - net	1,012	992
Regulatory assets	41	43
Accrued pension and postretirement costs	13	8
Lease right-of-use assets	6	7
Domestic - other	2	1
Total deferred tax liabilities	1,074	1,051
Net deferred tax liability	865	$ 835
Kentucky Utilities Co [Member] | Federal [Member] | General Business Tax Credit Carryforward [Member]
Deferred Tax Assets
State tax credit carryforwards	4
Valuation allowances	$ (3)