Income and Other Taxes (Deferred Tax Assets and Liabilities and Loss Carryforwards) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (Loss) from Continuing Operations (Details) [Abstract]
Domestic income		$ 1,463	$ 968	$ 922
Foreign income		1,087	1,100	1,207
Income Before Income Taxes		2,550	2,068	2,129
Deferred Tax Assets
Deferred investment tax credits		51	50
Regulatory obligations		94	123
Accrued pension costs		250	217
Federal loss carryforwards		565	587
State loss carryforwards		326	319
Federal and state tax credit carryforwards		256	201
Foreign capital loss carryforwards		302	387
Foreign loss carryforwards		3	4
Foreign - pensions		41	171
Foreign - regulatory obligations		6	12
Foreign - other		5	8
Contributions in aid of construction		141	139
Domestic - other		188	209
Unrealized losses on qualifying derivatives		20	15
Valuation allowances	[1]	(593)	(662)
Total deferred tax assets		1,655	1,780
Deferred Tax Liabilities
Domestic plant - net		4,325	3,875
Taxes recoverable through future rates		170	162
Other regulatory assets		343	332
Reacquired debt costs		25	28
Foreign plant - net		640	777
Domestic - other		14	24
Total deferred tax liabilities		5,517	5,198
Net deferred tax liability		3,862	3,418
State Loss Carryforwards And Valuation Allowances Net Spinoff Segment		77
Federal loss carryforwards		565	587
Federal [Member]
Deferred Tax Assets
Federal loss carryforwards		554
Deferred Tax Liabilities
Net operating losses		1,583
Charitable contributions		28
Federal loss carryforwards		554
Charitable contribution carryforwards		11
Loss carryfoward valuation allowance on net operating losses		0
Charitable Contributions Loss Carryforwards valuation allowance		0
State [Member]
Deferred Tax Assets
State loss carryforwards		325
Deferred Tax Liabilities
Net operating losses		5,387
Charitable contributions		12
Charitable contribution carryforwards		1
Loss carryfoward valuation allowance on net operating losses		(269)
Charitable Contributions Loss Carryforwards valuation allowance		0
Foreign Tax Authority [Member]
Deferred Tax Assets
Foreign capital loss carryforwards		302
Foreign loss carryforwards		3
Deferred Tax Liabilities
Net operating losses		17
Capital losses		1,783
Loss carryfoward valuation allowance on net operating losses		(3)
Loss carryfoward valuation allowance on capital losses		(302)
Other Noncurrent Assets [Member]
Deferred Tax Liabilities
Deferred Tax Assets, State Taxes		27	22
PPL Electric Utilities Corp [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		552	416	423
Deferred Tax Assets
Regulatory obligations		34	56
Accrued pension costs		107	92
Federal loss carryforwards		147	146
State loss carryforwards		22	27
Contributions in aid of construction		112	111
Domestic - other		81	87
Total deferred tax assets		503	519
Deferred Tax Liabilities
Domestic plant - net		2,001	1,803
Taxes recoverable through future rates		141	135
Other regulatory assets		240	213
Reacquired debt costs		15	18
Domestic - other		5	13
Total deferred tax liabilities		2,402	2,182
Net deferred tax liability		1,899	1,663
Federal loss carryforwards		147	146
PPL Electric Utilities Corp [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards		144
Deferred Tax Liabilities
Net operating losses		411
Charitable contributions		5
Federal loss carryforwards		144
Charitable contribution carryforwards		2
PPL Electric Utilities Corp [Member] | State [Member]
Deferred Tax Assets
State loss carryforwards	[2]	21
Deferred Tax Liabilities
Net operating losses		327
Charitable contributions		11
Charitable contribution carryforwards		1
LG And E And KU Energy LLC [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		686	603	553
Deferred Tax Assets
Deferred investment tax credits		51	50
Regulatory obligations		60	66
Accrued pension costs		58	53
Income taxes due to customers		15	17
Federal loss carryforwards		248	280
State loss carryforwards		35	35
Federal and state tax credit carryforwards		186	181
Contributions in aid of construction		29	29
Domestic - other		49	55
Unrealized losses on qualifying derivatives		12	18
Valuation allowances		(11)	(12)
Total deferred tax assets		732	772
Deferred Tax Liabilities
Domestic plant - net		2,352	2,105
Other regulatory assets		102	119
Domestic - other		13	11
Total deferred tax liabilities		2,467	2,235
Net deferred tax liability		1,735	1,463
Federal loss carryforwards		248	280
LG And E And KU Energy LLC [Member] | Federal [Member]
Deferred Tax Assets
Federal loss carryforwards		248
Deferred Tax Liabilities
Net operating losses		709
Charitable contributions		11
Federal loss carryforwards		248
Charitable contribution carryforwards		4
Loss carryfoward valuation allowance on net operating losses		0
Charitable Contributions Loss Carryforwards valuation allowance		0
LG And E And KU Energy LLC [Member] | State [Member]
Deferred Tax Assets
Federal loss carryforwards		35
Deferred Tax Liabilities
Net operating losses		907
Federal loss carryforwards		35
Loss carryfoward valuation allowance on net operating losses		0
Louisville Gas And Electric Co [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		329	299	272
Deferred Tax Assets
Deferred investment tax credits		14	13
Regulatory obligations		34	38
Income taxes due to customers		17	17
Federal loss carryforwards		80	76
Contributions in aid of construction		18	18
Domestic - other		17	15
Unrealized losses on qualifying derivatives		12	18
Total deferred tax assets		192	195
Deferred Tax Liabilities
Domestic plant - net		1,058	914
Other regulatory assets		65	75
Accrued pension costs		35	28
Domestic - other		8	7
Total deferred tax liabilities		1,166	1,024
Net deferred tax liability		974	829
Federal loss carryforwards		80	76
Louisville Gas And Electric Co [Member] | Federal [Member]
Deferred Tax Liabilities
Net operating losses		229
Charitable contributions		$ 7
Expiration - operating losses		Dec. 31, 2035
Kentucky Utilities Co [Member]
Income (Loss) from Continuing Operations (Details) [Abstract]
Income Before Income Taxes		$ 428	374	$ 355
Deferred Tax Assets
Deferred investment tax credits		37	36
Regulatory obligations		26	28
Federal loss carryforwards		79	97
Contributions in aid of construction		11	11
Domestic - other		11	7
Total deferred tax assets		164	179
Deferred Tax Liabilities
Domestic plant - net		1,280	1,175
Other regulatory assets		37	44
Accrued pension costs		12	4
Domestic - other		5	2
Total deferred tax liabilities		1,334	1,225
Net deferred tax liability		1,170	1,046
Federal loss carryforwards		79	$ 97
Kentucky Utilities Co [Member] | Federal [Member]
Deferred Tax Liabilities
Net operating losses		$ 227
Expiration - operating losses		Dec. 31, 2035
Minimum [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2029
Expiration - charitable contributions		Dec. 31, 2020
Minimum [Member] | State [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2017
Expiration - charitable contributions		Dec. 31, 2017
Minimum [Member] | PPL Electric Utilities Corp [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2031
Expiration - charitable contributions		Dec. 31, 2020
Minimum [Member] | PPL Electric Utilities Corp [Member] | State [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2030
Expiration - charitable contributions		Dec. 31, 2017
Minimum [Member] | LG And E And KU Energy LLC [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2029
Expiration - charitable contributions		Dec. 31, 2020
Minimum [Member] | LG And E And KU Energy LLC [Member] | State [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2028
Minimum [Member] | Louisville Gas And Electric Co [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - charitable contributions		Dec. 31, 2020
Maximum [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2035
Expiration - charitable contributions		Dec. 31, 2021
Maximum [Member] | State [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2036
Expiration - charitable contributions		Dec. 31, 2021
Maximum [Member] | PPL Electric Utilities Corp [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2035
Expiration - charitable contributions		Dec. 31, 2021
Maximum [Member] | PPL Electric Utilities Corp [Member] | State [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2032
Expiration - charitable contributions		Dec. 31, 2021
Maximum [Member] | LG And E And KU Energy LLC [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2035
Expiration - charitable contributions		Dec. 31, 2021
Maximum [Member] | LG And E And KU Energy LLC [Member] | State [Member]
Deferred Tax Liabilities
Expiration - operating losses		Dec. 31, 2036
Maximum [Member] | Louisville Gas And Electric Co [Member] | Federal [Member]
Deferred Tax Liabilities
Expiration - charitable contributions		Dec. 31, 2021

[1] 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 remained with PPL after the spinoff.

[2] An immaterial amount of valuation allowances has been recorded against the deferred tax asset for state contributions.