Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Income (Loss) from Continuing Operations (Details) [Abstract]
Domestic income	$ 196		$ 994	$ 1,715
Foreign income	1,113		1,088	486
Income (Loss) Before Income Taxes	1,309		2,082	2,201
Deferred Tax Assets
Deferred investment tax credits	137		130
Regulatory obligations	144		124
Accrued pension costs	140		276
Federal loss carryforwards	331		524
State loss carryforwards	304		305
Federal and state tax credit carryforwards	332		287
Foreign capital loss carryforwards	467		525
Foreign loss carryforwards	6		6
Foreign - pensions	202		254
Foreign - regulatory obligations	26		27
Foreign - other	12		16
Contributions in aid of construction	137		134
Domestic - other	211		239
Valuation allowances	(663)		(706)
Total deferred tax assets	1,786		2,141
Deferred Tax Liabilities
Domestic plant - net	4,073		3,967
Taxes recoverable through future rates	151		141
Unrealized gain on qualifying derivatives	37		122
Other regulatory assets	244		319
Reacquired debt costs	34		40
Foreign plant - net	859		937
Domestic - other	78		66
Total deferred tax liabilities	5,476		5,592
Net deferred tax liability	3,690		3,451
Federal [Member]
Loss carryforwards
Net operating losses	952	[1]
Federal [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2028
Federal [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2032
State [Member]
Loss carryforwards
Net operating losses	5,011	[1],[2]
Capital losses	125	[3]
State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2014
Expiration - capital losses	Dec. 31, 2014
State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2033
Expiration - capital losses	Dec. 31, 2016
Foreign [Member]
Loss carryforwards
Net operating losses	30	[4]
Capital losses	2,333	[5]
PPL Energy Supply LLC [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income (Loss) Before Income Taxes	(371)		738	1,212
Deferred Tax Assets
Deferred investment tax credits	84		75
Accrued pension costs	39		94
Federal loss carryforwards	28		51
State loss carryforwards	80		79
Federal and state tax credit carryforwards	131		113
Domestic - other	69		68
Valuation allowances	(78)		(74)
Total deferred tax assets	353		406
Deferred Tax Liabilities
Domestic plant - net	1,392		1,579
Unrealized gain on qualifying derivatives	38		173
Domestic - other	46		44
Total deferred tax liabilities	1,476		1,796
Net deferred tax liability	1,123		1,390
PPL Energy Supply LLC [Member] | Federal [Member]
Loss carryforwards
Net operating losses	80
PPL Energy Supply LLC [Member] | Federal [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2031
PPL Energy Supply LLC [Member] | Federal [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2032
PPL Energy Supply LLC [Member] | State [Member]
Loss carryforwards
Net operating losses	1,204	[6]
PPL Energy Supply LLC [Member] | State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2014
PPL Energy Supply LLC [Member] | State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2033
PPL Electric Utilities Corp [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income (Loss) Before Income Taxes	317		204	257
Deferred Tax Assets
Regulatory obligations	38		24
Accrued pension costs	42		81
Federal loss carryforwards	72		81
State loss carryforwards	35		39
Contributions in aid of construction	109		106
Domestic - other	45		46
Total deferred tax assets	341		377
Deferred Tax Liabilities
Domestic plant - net	1,366		1,229
Taxes recoverable through future rates	129		122
Other regulatory assets	129		174
Reacquired debt costs	23		27
Domestic - other	8		12
Total deferred tax liabilities	1,655		1,564
Net deferred tax liability	1,314		1,187
PPL Electric Utilities Corp [Member] | Federal [Member]
Loss carryforwards
Net operating losses	206
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, 2032
PPL Electric Utilities Corp [Member] | State [Member]
Loss carryforwards
Net operating losses	534
PPL Electric Utilities Corp [Member] | State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2030
PPL Electric Utilities Corp [Member] | State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2032
LG And E And KU Energy LLC [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income (Loss) Before Income Taxes	551		331	419
Deferred Tax Assets
Deferred investment tax credits	52		54
Regulatory obligations	107		99
Accrued pension costs	26		42
Federal loss carryforwards	222		376
State capital loss carryforward	4		5
Income taxes due to customers	23		26
Federal and state tax credit carryforwards	179		170
Domestic - other	57		41
Valuation allowances	(4)		(5)
Total deferred tax assets	666		808
Deferred Tax Liabilities
Domestic plant - net	1,327		1,171
Other regulatory assets	133		152
Domestic - other	12		13
Total deferred tax liabilities	1,472		1,336
Net deferred tax liability	806		528
LG And E And KU Energy LLC [Member] | Federal [Member]
Loss carryforwards
Net operating losses	523
LG And E And KU Energy LLC [Member] | Federal [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2028
LG And E And KU Energy LLC [Member] | Federal [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2032
LG And E And KU Energy LLC [Member] | State [Member]
Loss carryforwards
Net operating losses	1,024
Capital losses	106
LG And E And KU Energy LLC [Member] | State [Member] | Minimum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2028
Expiration - capital losses	Dec. 31, 2014
LG And E And KU Energy LLC [Member] | State [Member] | Maximum [Member]
Loss carryforwards
Expiration - operating losses	Dec. 31, 2032
Expiration - capital losses	Dec. 31, 2016
Louisville Gas And Electric Co [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income (Loss) Before Income Taxes	257		192	195
Deferred Tax Assets
Deferred investment tax credits	15		16
Regulatory obligations	59		54
Income taxes due to customers	19		21
Domestic - other	28		9
Total deferred tax assets	121		100
Deferred Tax Liabilities
Domestic plant - net	585		526
Other regulatory assets	83		86
Accrued pension costs	24		27
Domestic - other	8		9
Total deferred tax liabilities	700		648
Net deferred tax liability	579		548
Louisville Gas And Electric Co [Member] | Federal [Member]
Loss carryforwards
Net operating losses	10
Expiration - operating losses	Dec. 31, 2032
Louisville Gas And Electric Co [Member] | State [Member]
Loss carryforwards
Net operating losses	22
Expiration - operating losses	Dec. 31, 2030
Kentucky Utilities Co [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income (Loss) Before Income Taxes	360		215	282
Deferred Tax Assets
Deferred investment tax credits	38		38
Regulatory obligations	47		45
Accrued pension costs			(5)
Federal loss carryforwards	23		20
Income taxes due to customers	4		5
Domestic - other	8		7
Total deferred tax assets	120		110
Deferred Tax Liabilities
Domestic plant - net	721		623
Other regulatory assets	50		65
Domestic - other	4		5
Total deferred tax liabilities	775		693
Net deferred tax liability	655		583
Kentucky Utilities Co [Member] | Federal [Member]
Loss carryforwards
Net operating losses	$ 65
Expiration - operating losses	Dec. 31, 2032

[1] 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.

[2] A valuation allowance of $185 million has been recorded against the deferred tax assets for these losses

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

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

[5] A valuation allowance of $467 million has been recorded against the deferred tax assets for these losses.

[6] A valuation allowance of $78 million has been recorded against the deferred tax assets for these losses.