Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Expense (Benefit)
Current - Federal	$ (1)	$ (8)	$ (10)
Current - State	36	24	19
Current - Foreign	(1)	(2)	0
Total Current Expense	34	14	9
Deferred - Federal	28	135	141
Deferred - State	105	94	76
Deferred - Foreign	383	101	(14)
Total Deferred Expense (Benefit), excluding operating loss carry forwards	516	330	203
Amortization of investment tax credit	(3)	(3)	(3)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	12	6	7
Deferred - State	(56)	(33)	(33)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	(44)	(27)	(26)
Total income tax from continuing operations	503	314	183
Income tax expense [Abstract]
Total income tax expense - Federal	36	130	135
Total income tax expense - State	85	85	62
Total income tax expense - Foreign	382	99	(14)
Total income tax from continuing operations	503	314	183
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract]
Income tax related to other comprehensive income	150	(19)	(93)
Total income tax expense (benefits) excluded from income taxes from continuing operations	1,569	169	133
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	109	200	193
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	23	48	45
Valuation allowance adjustments	48	24	22
Federal and state income tax return adjustments	(3)	(9)	1
Impact of the United Kingdom Finance Acts on deferred tax balances	383	101	(14)
Depreciation and other items not normalized	(5)	(5)	(10)
Amortization of excess deferred federal and state income taxes	(54)	(43)	(40)
Kentucky recycling credit, net of federal income tax expense	0	0	(18)
Other	(4)	(9)	0
Total increase (decrease)	394	114	(10)
Total income tax from continuing operations	$ 503	$ 314	$ 183
Effective income tax rate	96.50%	32.90%	19.90%
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized	$ 15	$ 24	$ 25
Taxes, other than income
State gross receipts	113	100	107
Domestic property and other	94	80	79
Total	207	180	186
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, U.K. Finance Act 2020, Amount	106
Deferred Tax Assets, Valuation Allowances	462	536
Reclassification from AOCI due to sale of UK utility business	660	0	0
Nondeductible officers salary	6	7	4
WPD [Member]
Taxes, other than income
Income tax related to Discontinued Operations	759	188	226
Foreign Tax Authority [Member]
Income Tax Expense (Benefit)
Deferred - Foreign		106
PPL Electric Utilities Corp [Member]
Income Tax Expense (Benefit)
Current - Federal	40	61	44
Current - State	35	23	15
Total Current Expense	75	84	59
Deferred - Federal	59	45	51
Deferred - State	20	38	39
Total Deferred Expense (Benefit), excluding operating loss carry forwards	79	83	90
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations	154	167	149
Income tax expense [Abstract]
Total income tax expense - Federal	99	106	95
Total income tax expense - State	55	61	54
Total income tax from continuing operations	154	167	149
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	126	139	127
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	46	52	47
Federal and state income tax return adjustments	0	(4)	1
Depreciation and other items not normalized	(5)	(5)	(10)
Amortization of excess deferred federal and state income taxes	(14)	(16)	(18)
Other	1	1	2
Total increase (decrease)	28	28	22
Total income tax from continuing operations	$ 154	$ 167	$ 149
Effective income tax rate	25.70%	25.20%	24.60%
Taxes, other than income
State gross receipts	$ 113	$ 100	$ 107
Domestic property and other	7	7	5
Total	120	107	112
Louisville Gas And Electric Co [Member]
Income Tax Expense (Benefit)
Current - Federal	41	53	4
Current - State	5	7	4
Total Current Expense	46	60	8
Deferred - Federal	1	(4)	46
Deferred - State	8	7	10
Total Deferred Expense (Benefit), excluding operating loss carry forwards	9	3	56
Amortization of investment tax credit	(1)	(1)	(1)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations	54	62	63
Income tax expense [Abstract]
Total income tax expense - Federal	41	48	49
Total income tax expense - State	13	14	14
Total income tax from continuing operations	54	62	63
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	64	64	62
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	12	12	12
Valuation allowance adjustments	0	0	14
Amortization of excess deferred federal and state income taxes	(20)	(11)	(10)
Kentucky recycling credit, net of federal income tax expense	0	0	(14)
Other	(2)	(3)	(1)
Total increase (decrease)	(10)	(2)	1
Total income tax from continuing operations	$ 54	$ 62	$ 63
Effective income tax rate	17.80%	20.30%	21.40%
Taxes, other than income
Domestic property and other	$ 46	$ 40	$ 39
Total	46	40	39
Deferred Tax Assets, Valuation Allowances	11	12
Kentucky Utilities Co [Member]
Income Tax Expense (Benefit)
Current - Federal	58	40	35
Current - State	8	3	5
Total Current Expense	66	43	40
Deferred - Federal	(4)	11	28
Deferred - State	7	11	13
Total Deferred Expense (Benefit), excluding operating loss carry forwards	3	22	41
Amortization of investment tax credit	(2)	(2)	(2)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations	67	63	79
Income tax expense [Abstract]
Total income tax expense - Federal	52	49	61
Total income tax expense - State	15	14	18
Total income tax from continuing operations	67	63	79
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	76	72	78
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	14	14	15
Valuation allowance adjustments	0	0	4
Amortization of investment tax credit	(2)	(2)	(2)
Amortization of excess deferred federal and state income taxes	(20)	(17)	(13)
Kentucky recycling credit, net of federal income tax expense	0	0	(4)
Other	(1)	(4)	1
Total increase (decrease)	(9)	(9)	1
Total income tax from continuing operations	$ 67	$ 63	$ 79
Effective income tax rate	18.40%	18.40%	21.20%
Taxes, other than income
Domestic property and other	$ 41	$ 37	$ 35
Total	41	37	$ 35
Deferred Tax Assets, Valuation Allowances	$ 3	$ 4