Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Income (Loss) from Continuing Operations (Details) [Abstract]
Domestic income		$ 968		$ 922	$ 669
Foreign income		1,100		1,207	1,059
Income Before Income Taxes		2,068		2,129	1,728
Deferred Tax Assets
Deferred investment tax credits		50		52
Regulatory obligations		123		131
Accrued pension costs		217		200
Federal loss carryforwards	[1]	587		129
State loss carryforwards	[2]	319		225
Federal and state tax credit carryforwards		201		196
Foreign capital loss carryforwards		387		446
Foreign loss carryforwards		4		6
Foreign - pensions		171		182
Foreign - regulatory obligations		12		23
Foreign - other		8		11
Contributions in aid of construction		139		138
Domestic - other		209		194
Unrealized losses on qualifying derivatives		15		46
Valuation allowances	[2]	(662)		(622)
Total deferred tax assets		1,780		1,357
Deferred Tax Liabilities
Domestic plant - net		3,875		3,079
Taxes recoverable through future rates		162		156
Other regulatory assets		332		322
Reacquired debt costs		28		31
Foreign plant - net		777		854
Domestic - other		24		17
Total deferred tax liabilities		5,198		4,459
Net deferred tax liability		3,418		3,102
State loss carryforwards and related valuation allowances previously reflected on the PPL Energy Supply segment		77
Federal [Member]
Loss carryforwards
Net operating losses	[3]	1,660
Charitable contributions		$ 15
Expiration - charitable contributions		Dec. 31, 2020
Federal [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2029
Federal [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2035
State [Member]
Loss carryforwards
Net operating losses	[3],[4]	$ 5,269
Charitable contributions		34
Loss carryfoward valuation allowance on net operating losses		$ 254
State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2017
Expiration - charitable contributions		Dec. 31, 2016
State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2035
Expiration - charitable contributions		Dec. 31, 2020
Foreign [Member]
Loss carryforwards
Net operating losses	[5]	$ 21
Capital losses	[6]	2,152
Loss carryfoward valuation allowance on net operating losses		4
Loss carryfoward valuation allowance on capital losses		387
Other Noncurrent Assets [Member]
Deferred Tax Liabilities
State deferred tax assets		22
PPL Electric Utilities Corp [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		416		423	317
Deferred Tax Assets
Regulatory obligations		56		39
Accrued pension costs		92		85
Federal loss carryforwards	[7]	146		51
State loss carryforwards		27		30
Contributions in aid of construction		111		110
Domestic - other		87		54
Total deferred tax assets		519		369
Deferred Tax Liabilities
Domestic plant - net		1,803		1,453
Taxes recoverable through future rates		135		132
Other regulatory assets		213		173
Reacquired debt costs		18		20
Domestic - other		13		16
Total deferred tax liabilities		2,182		1,794
Net deferred tax liability		1,663		1,425
PPL Electric Utilities Corp [Member] | Federal [Member]
Loss carryforwards
Net operating losses		411
Charitable contributions		$ 3
Expiration - charitable contributions		Dec. 31, 2020
PPL Electric Utilities Corp [Member] | Federal [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2031
PPL Electric Utilities Corp [Member] | Federal [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2035
PPL Electric Utilities Corp [Member] | State [Member]
Loss carryforwards
Net operating losses		$ 410
Charitable contributions		$ 13
PPL Electric Utilities Corp [Member] | State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2030
Expiration - charitable contributions		Dec. 31, 2016
PPL Electric Utilities Corp [Member] | State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2032
Expiration - charitable contributions		Dec. 31, 2020
LG And E And KU Energy LLC [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		$ 603		553	551
Deferred Tax Assets
Deferred investment tax credits		50		51
Regulatory obligations		66		92
Accrued pension costs		53		53
Federal loss carryforwards	[8]	280		46
Income taxes due to customers		17		20
State loss carryforwards		35		36
Federal and state tax credit carryforwards		181		182
Domestic - other		55		44
Unrealized losses on qualifying derivatives		18		45
Valuation allowances		(12)		0
Total deferred tax assets		743		569
Deferred Tax Liabilities
Domestic plant - net		2,076		1,639
Other regulatory assets		119		143
Domestic - other		11		12
Total deferred tax liabilities		2,206		1,794
Net deferred tax liability		1,463		1,225
LG And E And KU Energy LLC [Member] | Federal [Member]
Loss carryforwards
Net operating losses		$ 801
LG And E And KU Energy LLC [Member] | Federal [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2029
LG And E And KU Energy LLC [Member] | Federal [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2035
LG And E And KU Energy LLC [Member] | State [Member]
Loss carryforwards
Net operating losses		$ 934
Capital losses		$ 1
Expiration - capital losses		Dec. 31, 2016
LG And E And KU Energy LLC [Member] | State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2028
LG And E And KU Energy LLC [Member] | State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses		Dec. 31, 2035
Louisville Gas And Electric Co [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		$ 299		272	257
Deferred Tax Assets
Deferred investment tax credits		13		14
Regulatory obligations		38		51
Federal loss carryforwards		76	[9]	0
Income taxes due to customers		17		18
Domestic - other		15		9
Unrealized losses on qualifying derivatives		18		32
Total deferred tax assets		177		124
Deferred Tax Liabilities
Domestic plant - net		896		698
Other regulatory assets		75		90
Accrued pension costs		28		28
Domestic - other		7		8
Total deferred tax liabilities		1,006		824
Net deferred tax liability		829		700
Louisville Gas And Electric Co [Member] | Federal [Member]
Loss carryforwards
Net operating losses		$ 218
Expiration - operating losses		Dec. 31, 2035
Kentucky Utilities Co [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		$ 374		355	$ 360
Deferred Tax Assets
Deferred investment tax credits		36		37
Regulatory obligations		28		41
Federal loss carryforwards		97	[10]	0
Income taxes due to customers		0		2
Domestic - other		7		7
Unrealized losses on qualifying derivatives		0		13
Total deferred tax assets		168		100
Deferred Tax Liabilities
Domestic plant - net		1,164		922
Other regulatory assets		44		53
Domestic - other		6		7
Total deferred tax liabilities		1,214		982
Net deferred tax liability		1,046		$ 882
Kentucky Utilities Co [Member] | Federal [Member]
Loss carryforwards
Net operating losses		$ 279
Expiration - operating losses		Dec. 31, 2035

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

[2] Includes $77 million of deferred tax assets related to state loss carryforwards and related valuation allowances previously reflected on the PPL Energy Supply Segment. The deferred tax assets and related valuation allowance remain with PPL after the spino ff.

[3] Includes an insignificant amount of federal and state net operating loss carryforwards from excess tax deductions related to stock compensation for which a tax benefit will be recorded in Equity when realized.

[4] A valuation allowance of $254 million has been recorded against the deferred tax assets for these losse s.

[5] A valuation allowance of $4 million has been recorded against the deferred tax assets for these losses .

[6] A valuation allowance of $ 387 million has been reco rded against the deferred tax assets for these losses .

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

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

[9] Increase in Federal loss carryforwards primarily relates to the e xtension of bonus depreciation.

[10] Increase in Federal loss carryforwards primarily relates to the extension of bonus depreciation.