Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit)
Current - Federal	$ (10)	$ (19)	$ 6
Current - State	19	17	25
Current - Foreign	91	104	45
Total Current Expense	100	102	76
Deferred - Federal	139	203	532
Deferred - State	76	100	88
Deferred - Foreign	123	107	133
Total Deferred Expense (Benefit), excluding operating loss carry forwards	338	410	753
Amortization of investment tax credit	(3)	(3)	(3)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	7	(20)	(16)
Deferred - State	(33)	(31)	(26)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	(26)	(51)	(42)
Total income tax from continuing operations	409	458	784
Income tax expense [Abstract]
Total income tax expense - Federal	133	161	519
Total income tax expense - State	62	86	87
Total income tax expense - Foreign	214	211	178
Total income tax from continuing operations	409	458	784
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract]
Other comprehensive income	(93)	(6)	(34)
Valuation allowance on state deferred taxes recorded to other comprehensive income	0	0	(1)
Total income tax expense (benefits) excluded from incomes taxes from continuing operations	(93)	(6)	(35)
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	453	480	669
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	45	40	46
Valuation allowance adjustments	22	21	36
Impact of lower U.K. income tax rates	(25)	(25)	(176)
U.S. income tax on foreign earnings - net of foreign tax credit	2	3	47
Foreign income return adjustments	0	0	(8)
Impact of the United Kingdom Finance Acts on deferred tax balances	(14)	(13)	(16)
Depreciation and other items not normalized	(10)	(11)	(10)
Amortization of excess deferred federal and state income taxes	(40)	(37)	0
Interest benefit on United Kingdom financing entities	(12)	(17)	(16)
Deferred tax impact of U.S. tax reform	0	0	220
Deferred tax impact of Kentucky tax reform	0	9	0
Kentucky recycling credit, net of federal income tax expense	(18)	0	0
Other	6	8	(8)
Total increase (decrease)	(44)	(22)	115
Total income tax from continuing operations	$ 409	$ 458	$ 784
Effective income tax rate	19.00%	20.00%	41.00%
Income Tax Reconciliation Valuation Allowance Foreign Tax Credits			$ 23
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized	$ 25	$ 24	16
Deferred Income Tax Expense Benefit Foreign Pension Contribution			35
Taxes, other than income
State gross receipts	107	103	102
State capital stock	0	0	(6)
Foreign property	127	134	127
Domestic property and other	79	75	69
Total	313	312	292
Income Tax Reconciliation Valuation Allowance Foreign Tax Credits			23
Tax Cuts And Jobs Act [Member]
Income Tax Expense (Benefit)
Deferred Income Tax Expense (Benefit) Tax Rate Change			220
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations			321
Income tax expense [Abstract]
Total income tax from continuing operations			321
Increase (decrease) due to:
Total income tax from continuing operations			321
Deferred Income Tax Expense Benefit Tax Reform			83
Taxable Deemed Dividend			462
Taxes, other than income
Deferred Income Tax Expense (Benefit) Net Operating Loss			162
Deferred Income Tax Benefit Foreign Tax Credits			60
Deferred Tax Assets, Foreign Tax Credit Carryforwards			205
Valuation Rollfoward Specific Transaction Additions Foreign Tax Credits			145
Credit Carryforward Valuation Allowance Foreign Tax Credits			122
Credit Carryforward Expected Realization Foreign Tax Credits			83
PPL Electric Utilities Corp [Member]
Income Tax Expense (Benefit)
Current - Federal	44	2	(65)
Current - State	15	9	20
Total Current Expense	59	11	(45)
Deferred - Federal	51	96	234
Deferred - State	39	37	29
Total Deferred Expense (Benefit), excluding operating loss carry forwards	90	133	263
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	0	(8)	(5)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	0	(8)	(5)
Total income tax from continuing operations	149	136	213
Income tax expense [Abstract]
Total income tax expense - Federal	95	90	164
Total income tax expense - State	54	46	49
Total income tax from continuing operations	149	136	213
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	127	119	201
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	47	43	36
Depreciation and other items not normalized	(10)	(11)	(8)
Amortization of excess deferred federal and state income taxes	(18)	(17)	0
Deferred tax impact of U.S. tax reform	0	0	(13)
Other	3	2	(3)
Total increase (decrease)	22	17	12
Total income tax from continuing operations	$ 149	$ 136	$ 213
Effective income tax rate	24.60%	24.00%	37.00%
Taxes, other than income
State gross receipts	$ 107	$ 103	$ 102
Domestic property and other	5	6	5
Total	112	109	107
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member]
Income Tax Expense (Benefit)
Deferred Income Tax Expense (Benefit) Tax Rate Change		(13)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations			(13)
Income tax expense [Abstract]
Total income tax from continuing operations			(13)
Increase (decrease) due to:
Total income tax from continuing operations			(13)
LG And E And KU Energy LLC [Member]
Income Tax Expense (Benefit)
Current - Federal	20	31	74
Current - State	0	4	6
Total Current Expense	20	35	80
Deferred - Federal	81	65	268
Deferred - State	5	34	32
Total Deferred Expense (Benefit), excluding operating loss carry forwards	86	99	300
Amortization of investment tax credit	(3)	(3)	(3)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	0	(2)	(2)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	0	(2)	(2)
Total income tax from continuing operations	103	129	375
Income tax expense [Abstract]
Total income tax expense - Federal	98	91	337
Total income tax expense - State	5	38	38
Total income tax from continuing operations	103	129	375
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract]
Other comprehensive income	(1)	5	(10)
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	120	121	242
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	23	22	26
Valuation allowance adjustments	(23)	(20)	(2)
Amortization of investment tax credit	(3)	(3)	(3)
Deferred tax impact of U.S. tax reform	0	0	112
Deferred tax impact of Kentucky tax reform	0	9	0
Kentucky recycling credit, net of federal income tax expense	(18)	0	0
Other	4	0	0
Total increase (decrease)	(17)	8	133
Total income tax from continuing operations	$ 103	$ 129	$ 375
Effective income tax rate	18.00%	22.50%	54.30%
Taxes, other than income
Domestic property and other	$ 74	$ 70	$ 65
Total	74	70	65
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member]
Income Tax Expense (Benefit)
Deferred Income Tax Expense (Benefit) Tax Rate Change		108
Deferred Income Tax Expense (Benefit) Expiring Tax Credit		4
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations			112
Income tax expense [Abstract]
Total income tax from continuing operations			112
Increase (decrease) due to:
Total income tax from continuing operations			112
Deferred Income Tax Expense Benefit Tax Reform		112
Louisville Gas And Electric Co [Member]
Income Tax Expense (Benefit)
Current - Federal	4	0	0
Current - State	4	4	5
Total Current Expense	8	4	5
Deferred - Federal	46	51	112
Deferred - State	10	10	14
Total Deferred Expense (Benefit), excluding operating loss carry forwards	56	61	126
Amortization of investment tax credit	(1)	(1)	(1)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	0	0	1
Total Tax Expense (Benefit) of Operating Loss Carryforwards	0	0	1
Total income tax from continuing operations	63	64	131
Income tax expense [Abstract]
Total income tax expense - Federal	49	50	112
Total income tax expense - State	14	14	19
Total income tax from continuing operations	63	64	131
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	62	62	120
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	12	11	14
Valuation allowance adjustments	14	0	0
Amortization of excess deferred federal and state income taxes	(10)	(8)	(1)
Kentucky recycling credit, net of federal income tax expense	(14)	0	0
Other	(1)	(1)	(2)
Total increase (decrease)	1	2	11
Total income tax from continuing operations	$ 63	$ 64	$ 131
Effective income tax rate	21.40%	21.50%	38.10%
Taxes, other than income
Domestic property and other	$ 39	$ 36	$ 33
Total	39	36	33
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member]
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations			0
Income tax expense [Abstract]
Total income tax from continuing operations			0
Increase (decrease) due to:
Total income tax from continuing operations			0
Kentucky Utilities Co [Member]
Income Tax Expense (Benefit)
Current - Federal	35	22	0
Current - State	5	6	7
Total Current Expense	40	28	7
Deferred - Federal	28	40	138
Deferred - State	13	10	16
Total Deferred Expense (Benefit), excluding operating loss carry forwards	41	50	154
Amortization of investment tax credit	(2)	(2)	(2)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations	79	76	159
Income tax expense [Abstract]
Total income tax expense - Federal	61	60	136
Total income tax expense - State	18	16	23
Total income tax from continuing operations	79	76	159
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	78	76	146
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	15	13	15
Valuation allowance adjustments	4	0	0
Amortization of investment tax credit	(2)	(2)	(2)
Amortization of excess deferred federal and state income taxes	(13)	(12)	(1)
Kentucky recycling credit, net of federal income tax expense	(4)	0	0
Other	1	1	1
Total increase (decrease)	1	0	13
Total income tax from continuing operations	$ 79	$ 76	$ 159
Effective income tax rate	21.20%	21.00%	38.00%
Taxes, other than income
Domestic property and other	$ 35	$ 34	$ 32
Total	$ 35	$ 34	32
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member]
Tax expense (benefit) of operating loss carryforwards [Abstract]
Total income tax from continuing operations			0
Income tax expense [Abstract]
Total income tax from continuing operations			0
Increase (decrease) due to:
Total income tax from continuing operations			$ 0