Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit)
Current - Federal	$ (19)	$ 6	$ (14)
Current - State	17	25	21
Current - Foreign	104	45	80
Total Current Expense	102	76	87
Deferred - Federal	203	532	385
Deferred - State	100	88	89
Deferred - Foreign	107	133	86
Total Deferred Expense (Benefit), excluding operating loss carry forwards	410	753	560
Amortization of investment tax credit	(3)	(3)	(3)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	(20)	(16)	25
Deferred - State	(31)	(26)	(21)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	(51)	(42)	4
Total income tax from continuing operations	458	784	648
Income tax expense [Abstract]
Total income tax expense - Federal	161	519	393
Total income tax expense - State	86	87	89
Total income tax expense - Foreign	211	178	166
Total income tax from continuing operations	458	784	648
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract]
Stock-based compensation recorded to Earnings Reinvested	0	0	(7)
Other comprehensive income	(6)	(34)	(6)
Valuation allowance on state deferred taxes recorded to other comprehensive income	0	(1)	1
Total income tax expense (benefits) excluded from incomes taxes from continuing operations	(6)	(35)	(12)
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	480	669	893
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	40	46	46
Valuation allowance adjustments	21	36	16
Impact of lower U.K. income tax rates	(25)	(176)	(177)
U.S. income tax on foreign earnings - net of foreign tax credit	3	47	(42)
Foreign income return adjustments	0	(8)	2
Impact of the United Kingdom Finance Acts on deferred tax balances	(13)	(16)	(49)
Depreciation and other items not normalized	(11)	(10)	(10)
Amortization of excess deferred federal and state income taxes	(37)	0	0
Interest benefit on United Kingdom financing entities	(17)	(16)	(17)
Stock-based compensation	4	(3)	(10)
Deferred tax impact of U.S. tax reform	0	220	0
Deferred tax impact of Kentucky tax reform	9	0	0
Other	4	(5)	(4)
Total increase (decrease)	(22)	115	(245)
Total income tax from continuing operations	$ 458	$ 784	$ 648
Effective income tax rate	20.00%	41.00%	25.40%
Income Tax Reconciliation Valuation Allowance Foreign Tax Credits		$ 23
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized	$ 24	16	$ 13
Deferred Income Tax Expense Benefit Statutory Tax Rate Change			(42)
Deferred Income Tax Expense Benefit Foreign Pension Contribution		35
Taxes, other than income
State gross receipts	103	102	100
State capital stock	0	(6)	0
Foreign property	134	127	135
Domestic property and other	75	69	66
Total	312	292	301
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	2	(65)	(29)
Current - State	9	20	19
Total Current Expense	11	(45)	(10)
Deferred - Federal	96	234	193
Deferred - State	37	29	29
Total Deferred Expense (Benefit), excluding operating loss carry forwards	133	263	222
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	(8)	(5)	0
Total Tax Expense (Benefit) of Operating Loss Carryforwards	(8)	(5)	0
Total income tax from continuing operations	136	213	212
Income tax expense [Abstract]
Total income tax expense - Federal	90	164	164
Total income tax expense - State	46	49	48
Total income tax from continuing operations	136	213	212
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	119	201	193
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	43	36	36
Depreciation and other items not normalized	(11)	(8)	(8)
Amortization of excess deferred federal and state income taxes	(17)	0	0
Stock-based compensation	1	(2)	(6)
Deferred tax impact of U.S. tax reform	0	(13)	0
Other	1	(1)	(3)
Total increase (decrease)	17	12	19
Total income tax from continuing operations	$ 136	$ 213	$ 212
Effective income tax rate	24.00%	37.00%	38.40%
Taxes, other than income
State gross receipts	$ 103	$ 102	$ 100
Domestic property and other	6	5	5
Total	109	107	105
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	31	74	(36)
Current - State	4	6	1
Total Current Expense	35	80	(35)
Deferred - Federal	65	268	248
Deferred - State	34	32	38
Total Deferred Expense (Benefit), excluding operating loss carry forwards	99	300	286
Amortization of investment tax credit	(3)	(3)	(3)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	(2)	(2)	10
Deferred - State	0	0	(1)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	(2)	(2)	9
Total income tax from continuing operations	129	375	257
Income tax expense [Abstract]
Total income tax expense - Federal	91	337	219
Total income tax expense - State	38	38	38
Total income tax from continuing operations	129	375	257
Income Tax Expense (Benefit) Excluded From Income Taxes [Abstract]
Other comprehensive income	5	(10)	(16)
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	121	242	240
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	22	26	26
Valuation allowance adjustments	(20)	(2)	(1)
Amortization of investment tax credit	(3)	(3)	(3)
Stock-based compensation	1	1	(3)
Deferred tax impact of U.S. tax reform	0	112	0
Deferred tax impact of Kentucky tax reform	9	0	0
Other	(1)	(1)	(2)
Total increase (decrease)	8	133	17
Total income tax from continuing operations	$ 129	$ 375	$ 257
Effective income tax rate	22.50%	54.30%	37.50%
Taxes, other than income
Domestic property and other	$ 70	$ 65	$ 62
Total	70	65	62
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	0	0	(22)
Current - State	4	5	1
Total Current Expense	4	5	(21)
Deferred - Federal	51	112	134
Deferred - State	10	14	18
Total Deferred Expense (Benefit), excluding operating loss carry forwards	61	126	152
Amortization of investment tax credit	(1)	(1)	(1)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	0	1	(4)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	0	1	(4)
Total income tax from continuing operations	64	131	126
Income tax expense [Abstract]
Total income tax expense - Federal	50	112	107
Total income tax expense - State	14	19	19
Total income tax from continuing operations	64	131	126
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	62	120	115
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	11	14	12
Amortization of investment tax credit	(1)	(1)	(1)
Amortization of excess deferred federal and state income taxes	(8)	(1)	0
Other	0	(1)	0
Total increase (decrease)	2	11	11
Total income tax from continuing operations	$ 64	$ 131	$ 126
Effective income tax rate	21.50%	38.10%	38.30%
Taxes, other than income
Domestic property and other	$ 36	$ 33	$ 32
Total	36	33	32
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	22	0	31
Current - State	6	7	5
Total Current Expense	28	7	36
Deferred - Federal	40	138	131
Deferred - State	10	16	19
Total Deferred Expense (Benefit), excluding operating loss carry forwards	50	154	150
Amortization of investment tax credit	(2)	(2)	(2)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	0	0	(21)
Total Tax Expense (Benefit) of Operating Loss Carryforwards	0	0	(21)
Total income tax from continuing operations	76	159	163
Income tax expense [Abstract]
Total income tax expense - Federal	60	136	139
Total income tax expense - State	16	23	24
Total income tax from continuing operations	76	159	163
Reconciliation of Income Tax Expense
Federal income tax on Income Before Income Taxes at statutory tax rate	76	146	150
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	13	15	16
Amortization of investment tax credit	(2)	(2)	(2)
Amortization of excess deferred federal and state income taxes	(12)	(1)	(1)
Other	1	1	0
Total increase (decrease)	0	13	13
Total income tax from continuing operations	$ 76	$ 159	$ 163
Effective income tax rate	21.00%	38.00%	38.10%
Taxes, other than income
Domestic property and other	$ 34	$ 32	$ 30
Total	$ 34	32	$ 30
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