Defined Benefits (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014
Defined Benefits [Line Items]
Accrued pension obligations	$ 244				$ 244
Accrued postretirement obligation	7				7
Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	26		$ 24		56		$ 49
Interest cost	52		56		110		112
Expected return on plan assets	(69)		(72)		(145)		(144)
Amortization of:
Prior service cost	2		5		4		10
Actuarial (gain) loss	22		7		47		14
Net periodic defined benefit costs (credits) prior to termination benefits	33	[1]	20	[2]	72	[1]	41	[2]
Termination benefits	0		20	[3]	0		20	[3]
Net periodic defined benefit costs (credits)	33	[1]	40	[2]	72	[1]	61	[2]
Net period defined benefit costs reflected in discontinued operations allocated from PPL's plans to PPL Energy Supply prior to the spinoff	7		23		18		28
Pension Benefits United States [Member] | PPL Energy Supply LLC [Member]
Amortization of:
Termination benefits			16				16
Pension Benefits United States [Member] | PPL Electric [Member]
Amortization of:
Termination benefits			4				4
Pension Benefits United Kingdom [Member]
Defined Benefits [Line Items]
Service cost	19		18		39		36
Interest cost	77		90		156		178
Expected return on plan assets	(129)		(132)		(260)		(262)
Amortization of:
Prior service cost	0		0		0		0
Actuarial (gain) loss	40		33		79		66
Net periodic defined benefit costs (credits) prior to termination benefits	7		9		14		18
Net periodic defined benefit costs (credits)	7		9		14		18
Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	3		3		7		6
Interest cost	7		8		14		16
Expected return on plan assets	(7)		(7)		(14)		(13)
Amortization of:
Net periodic defined benefit costs (credits)	3		4		7		9
PPL Electric Utilities Corp [Member] | PPL Services [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	8		10	[4]	16		15	[4]
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	6		5		13		11
Interest cost	17		16		34		33
Expected return on plan assets	(22)		(21)		(44)		(41)
Amortization of:
Prior service cost	2		1		4		2
Actuarial (gain) loss	9		3		17		6
Net periodic defined benefit costs (credits)	12		4		24		11
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	2		1		3		2
Interest cost	3		3		5		5
Expected return on plan assets	(2)		(2)		(3)		(3)
Amortization of:
Prior service cost	0		0		1		1
Net periodic defined benefit costs (credits)	3		2		6		5
Louisville Gas And Electric Co [Member] | LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	4		2		7		4
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1		1		1		1
Interest cost	4		3		7		7
Expected return on plan assets	(5)		(5)		(10)		(10)
Amortization of:
Prior service cost	0		0		1		1
Actuarial (gain) loss	3		2		6		3
Net periodic defined benefit costs (credits)	3		1		5		2
Kentucky Utilities Co [Member] | LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	$ 4		$ 1		$ 9		$ 4

[1] For the three and six months ended June 30, 2015 , the total net periodic defined benefit cost include $ 7 million and $ 18 million reflected in d iscontinued o perati ons related to costs allocated from PPL's plans to PPL Energy Supply prior to the spinoff .

[2] For the three and six months ended June 30, 2014 , the total net periodic defined benefit cost include $ 23 million and $ 28 million reflected in d iscontinued o perations related to costs allocated from PPL's plans to PPL Energy Supply.

[3] Includes termination benefits of $ 4 million for PPL Electric . The remaining $ 16 million relates to PPL Energy Supply and is reflected in d iscontinued o perations .

[4] The three and six months ended June 30, 2014 include $ 4 million of termination benefits for PPL Electric related to a one-time voluntary retirement window offered to certain bargaining unit employees.