Income and Other Taxes (Income Tax Expense and Reconciliation of Income Tax Expense) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Income Tax Expense (Benefit)
Current - Federal		$ (26)		$ 18		$ (102)
Current - State		25		26		0
Current - Foreign		89		152		181
Total Current Expense (Benefit)		88		196		79
Deferred - Federal		699		299		259
Deferred - State		68		120		84
Deferred - Foreign		41		96		(53)
Total Deferred Expense (Benefit), excluding operating loss carry forwards		808		515		290
Investment tax credit, net - Federal		(4)		(5)		(5)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal	[1]	(396)		8		14
Deferred - State		(31)		(22)		(18)
Total Tax Expense (Benefit) of Operating Loss Carryforwards		(427)		(14)		(4)
Total income tax from continuing operations		465		692		360
Income tax expense (benefit) from continuing operations [Abstract]
Total income tax expense - Federal		273		320		166
Total income tax expense - State		62		124		66
Total income tax expense - Foreign		130		248		128
Total income tax from continuing operations		465		692		360
Discontinued operations		(30)		198		(180)
Stock-based compensation recorded to Additional Paid-in Capital		0		(4)		(2)
Valuation allowance on state deferred taxes related to issuance costs of Purchase Contracts recorded to Additional Paid-in Capital		0		0		(2)
Other comprehensive income		(2)		(190)		159
Valuation allowance on state deferred taxes recorded to other comprehensive income		(4)		0		(7)
Total income tax expense (benefits) excluded from incomes taxes from continuing operations		(36)		4		(32)
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 724		$ 745		$ 605
Federal statutory rate		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit		$ 31		$ 28		$ 17
Valuation allowance adjustments	[2]	24		55		24
Impact of lower U.K. income tax rates	[3]	(176)		(180)		(144)
U.S. income tax on foreign earnings - net of foreign tax credit	[4]	8		63		21
Federal and state tax reserve adjustments		(22)	[5]	(1)		(49)	[5]
Impact of the United Kingdom Finance Acts on deferred tax balances	[3]	(91)		(1)		(97)
Depreciation not normalized		(5)		(7)		(8)
State deferred tax rate change		0		(1)	[6]	15	[6]
Interest benefit on United Kingdom financing entities		(20)		(5)		(7)
Other		(8)		(4)		(17)
Total increase (decrease)		(259)		(53)		(245)
Total income tax from continuing operations		$ 465		$ 692		$ 360
Effective income tax rate		22.50%		32.50%		20.80%
Expense related to increased Pennsylvania net operating loss carryforwards expected to be unutilized		$ 12
Expense related to federal tax credit carryforwards that are expected to expire as a result of future taxable earnings		$ 12
Adjustment to valuation allowance on deferred tax assets due to spinoff anouncement				$ 50
Expense related to a deferred tax valuation allowance due to a decrease in projected future taxable income						$ 23
United Kingdom statutory income tax rate in effect during period prior to a change		20.00%				23.00%
United Kingdom statutory income tax rate reduction in year one						21.00%
United Kingdom statutory income tax rate reduction in year two		19.00%				20.00%
United Kingdom statutory income tax rate reduction in year five		18.00%
Expense from increased taxable dividends				47		$ 28
Expense (benefit) related to the recalculation of 2010 United Kingdom earnings and profits						(19)
Benefit recorded in continuing operations related to the settlement of the IRS audit for tax years 1998-2011		$ 12
Benefit from favorable United States Tax Court decision on deductibility of United Kingdom windfall profit tax						(44)
Interest portion of benefit from favorable United States Tax Court decision on deductibility of United Kingdom windfall profit tax						19
Benefit recorded related to stranded cost securitization included in change in federal and state income tax reserves						(7)
Taxes, other than income
State gross receipts		89	[7]	102		98
Foreign property		148		157		147
Domestic property and other		62		58		53
Total		299		317		298
Previously recorded reserves		17
PPL Electric Utilities Corp [Member]
Income Tax Expense (Benefit)
Current - Federal		(80)		60		(15)
Current - State		23		15		(4)
Total Current Expense (Benefit)		(57)		75		(19)
Deferred - Federal		287		70		109
Deferred - State		12		16		16
Total Deferred Expense (Benefit), excluding operating loss carry forwards		299		86		125
Investment tax credit, net - Federal		0		(1)		(1)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal		(75)		0		4
Deferred - State		(3)		0		(1)
Total Tax Expense (Benefit) of Operating Loss Carryforwards		(78)		0		3
Total income tax from continuing operations		164		160		108
Income tax expense (benefit) from continuing operations [Abstract]
Total income tax expense - Federal		132		129		97
Total income tax expense - State		32		31		11
Total income tax from continuing operations		164		160		108
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 146		$ 148		$ 111
Federal statutory rate		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit		$ 25		$ 22		$ 16
Federal and state tax reserve adjustments		2		(1)		(9)	[8]
Federal and state income tax return adjustments		(2)		1		(1)
Depreciation not normalized		(4)		(6)		(6)
Other		(3)		(4)		(3)
Total increase (decrease)		18		12		(3)
Total income tax from continuing operations		$ 164		$ 160		$ 108
Effective income tax rate		39.40%		37.80%		34.10%
Benefit recorded related to stranded cost securitization included in change in federal and state income tax reserves						$ 7
Taxes, other than income
State gross receipts		$ 89	[9]	$ 102		98
Domestic property and other		5		5		5
Total		94		107		103
Previously recorded reserves		17
LG And E And KU Energy LLC [Member]
Income Tax Expense (Benefit)
Current - Federal		2		(247)		(59)
Current - State		1		8		10
Total Current Expense (Benefit)		3		(239)		(49)
Deferred - Federal		405		437		244
Deferred - State		32		23		20
Total Deferred Expense (Benefit), excluding operating loss carry forwards		437		460		264
Investment tax credit, net - Federal		(3)		(4)		(4)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal		(198)		(8)		(4)
Deferred - State		0		0		(1)
Total Tax Expense (Benefit) of Operating Loss Carryforwards		(198)		(8)		(5)
Total income tax from continuing operations		239		209		206
Income tax expense (benefit) from continuing operations [Abstract]
Total income tax expense - Federal		206		178		177
Total income tax expense - State		33		31		29
Total income tax from continuing operations		239		209		206
Discontinued operations		0		0		1
Other comprehensive income		(1)		(36)		18
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 211		$ 194		$ 193
Federal statutory rate		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit		$ 22		$ 20		$ 20
Valuation allowance adjustments		12	[10]	0		0
Amortization of investment tax credit		(3)		(4)		(4)
Other		(3)		(1)		(3)
Total increase (decrease)		28		15		13
Total income tax from continuing operations		$ 239		$ 209		$ 206
Effective income tax rate		39.60%		37.80%		37.40%
Taxes, other than income
Domestic property and other		$ 57		$ 52		$ 48
Total		57		52		48
Louisville Gas And Electric Co [Member]
Income Tax Expense (Benefit)
Current - Federal		(15)		(25)		52
Current - State		3		10		16
Total Current Expense (Benefit)		(12)		(15)		68
Deferred - Federal		190		114		33
Deferred - State		13		6		(2)
Total Deferred Expense (Benefit), excluding operating loss carry forwards		203		120		31
Investment tax credit, net - Federal		(1)		(2)		(2)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal		(76)		0		(3)
Total Tax Expense (Benefit) of Operating Loss Carryforwards		(76)		0		(3)
Total income tax from continuing operations		114		103		94
Income tax expense (benefit) from continuing operations [Abstract]
Total income tax expense - Federal		98		87		80
Total income tax expense - State		16		16		14
Total income tax from continuing operations		114		103		94
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 105		$ 95		$ 90
Federal statutory rate		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit		$ 11		$ 10		$ 10
Amortization of investment tax credit		(1)		(2)		(2)
Other		(1)		0		(4)
Total increase (decrease)		9		8		4
Total income tax from continuing operations		$ 114		$ 103		$ 94
Effective income tax rate		38.10%		37.90%		36.60%
Taxes, other than income
Domestic property and other		$ 28		$ 25		$ 24
Total		28		25		24
Kentucky Utilities Co [Member]
Income Tax Expense (Benefit)
Current - Federal		(21)		(95)		51
Current - State		1		6		12
Total Current Expense (Benefit)		(20)		(89)		63
Deferred - Federal		240		212		66
Deferred - State		19		14		8
Total Deferred Expense (Benefit), excluding operating loss carry forwards		259		226		74
Investment tax credit, net - Federal		(2)		(2)		(2)
Tax expense (benefit) of operating loss carryforwards [Abstract]
Deferred - Federal		(97)		0		(3)
Total Tax Expense (Benefit) of Operating Loss Carryforwards		(97)		0		(3)
Total income tax from continuing operations		140		135		132
Income tax expense (benefit) from continuing operations [Abstract]
Total income tax expense - Federal		120		115		112
Total income tax expense - State		20		20		20
Total income tax from continuing operations		140		135		132
Other comprehensive income		(1)		(1)		1
Reconciliation of Income Tax Expense
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35%		$ 131		$ 124		$ 126
Federal statutory rate		35.00%		35.00%		35.00%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit		$ 13		$ 13		$ 14
Amortization of investment tax credit		(2)		(2)		(2)
Other		(2)		0		(6)
Total increase (decrease)		9		11		6
Total income tax from continuing operations		$ 140		$ 135		$ 132
Effective income tax rate		37.40%		38.00%		36.70%
Taxes, other than income
Domestic property and other		$ 29		$ 27		$ 24
Total		$ 29		$ 27		$ 24

[1] Increase in Federal loss carryforwards primarily relates to the extension of bonus depreciation and the impact of bonus depreciation related to provision to return adjustments.

[2] During 2015, PPL recorded $24 million of deferred income tax expense related to deferred tax valuation allowances. PPL recorded state deferred income tax expense of $12 million primarily related to increased Pennsylvania net operating loss carryforwards expected to be unutilized and $12 million of federal deferred income tax expense primarily related to federal tax credit carryforwards that are expected to expire as a result of lower future taxable earnings due to the extension of bonus depr eciation. As a result of the PPL Energy Supply spinoff announcement, PPL recorded $50 million of deferred income tax expense during 2014 to adjust the valuation allowance on deferred tax assets primarily for state net operating loss carryforwards that we re previously supported by the future earnings of PPL Energy Supply. See Note 8 for additional information on the spinoff. During 2013, PPL recorded $23 million of state deferred income tax expense related to a deferred tax valuation allowance primarily due to a decrease in projected future taxable income at PPL Energy Supply over the remaining carryforward period of Pennsylvania net operating losses.

[3] The U.K. Finance Act 2015 , enacted in November 2015 , reduced the U.K. statutory income tax rate f rom 20% to 1 9% effective April 1, 2017 and from 19 % to 18% effective April 1, 2020 . As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit during 2015 related to both rate decreases. The U.K. Finance Act 2013, enact ed in July 2013, reduced the U.K. statutory income tax rate from 23% to 21% effective April 1, 2014 and from 21% to 20% effective April 1, 2015. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit during 2013 re lated to both rate decreases.

[4] During 2015, PPL recorded lower income taxes primarily attributable to a decrease in taxable dividends. During 2014, PPL recorded $47 million of income tax expense primarily attributable to taxable dividends. During 20 13, PPL recorded $28 million of income tax expense resulting from increased taxable dividends offset by a $19 million income tax benefit associated with a ruling obtained from the IRS impacting the recalculation of 2010 U.K. earnings and profits that was r eflected on an amended 2010 U.S. tax return.

[5] In 2015, PPL recorded a $12 million tax benefit related to the settlement of the IRS audit for the tax years 1998-2011. In May 2013, the Supreme Court ruled that the U.K. Windfall Profits Tax (WPT) imposed on privatized utilities, including WPD, is a creditable tax for U.S. federal income tax purposes. As a result of the Supreme Court ruling, PPL recorded a tax benefit of $44 million during 2013, of which $19 million relates to int erest. In 2013, PPL r ecorded a federal and state income tax reserve benefit of $7 million related to stranded cost securitization. The reserve balance at December 31, 2013 related to stranded costs securitization was zero.

[6] During each period, PPL recorded adjustments related to its December 31 state deferred tax liabilities as a result of annual changes in state apportionment and the impact on the future estimated state income tax rate .

[7] The decrease in 2015 was primarily due to the settlement of a 2011 gross receipts tax audit resulting in the reversal of $17 million of previously recognized reserves.

[8] PPL Electric recorded a tax benefit of $7 million during 2013 to federal and state income tax reserves related to stranded cost securitization. The reserve balance at December 31, 2013 related to stranded costs securitization wa s zero.

[9] The decrease in 2015 was primarily due to the settlement of a 2011 gross receipts tax audit resulting in the reversal of $17 million of previously recognized reserves.

[10] Represents a valuation allowance against tax credits expiring from 2016 through 2020 that are more likely than not to expire before being utilized.