Defined Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	$ 26		$ 31	$ 77		$ 94
Interest cost	58		53	175		160
Expected return on plan assets	(75)		(73)	(224)		(220)
Amortization of:
Prior service cost	5		6	15		17
Actuarial (gain) loss	8		20	23		60
Net periodic defined benefit costs (credits) prior to termination benefits	22		37	66		111
Termination benefits	(7)	[1]	0	13	[1]	0
Net periodic defined benefit costs (credits)	15		37	79		111
Pension Benefits United Kingdom [Member]
Defined Benefits [Line Items]
Service cost	18		18	54		52
Interest cost	90		79	268		238
Expected return on plan assets	(133)		(115)	(395)		(346)
Amortization of:
Prior service cost	0		0	0		0
Actuarial (gain) loss	34		37	100		112
Net periodic defined benefit costs (credits) prior to termination benefits	9		19	27		56
Net periodic defined benefit costs (credits)	9		19	27		56
Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	3		4	9		11
Interest cost	8		7	24		21
Expected return on plan assets	(6)		(6)	(19)		(18)
Amortization of:
Actuarial (gain) loss	0		1	0		4
Net periodic defined benefit costs (credits)	5		6	14		18
PPL Energy Supply LLC [Member]
Amortization of:
Termination benefits	(5)			11
PPL Energy Supply LLC [Member] | PPL Services [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	2	[2]	11	32	[2]	34
PPL Energy Supply LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1		1	4		5
Interest cost	3		2	7		6
Expected return on plan assets	(3)		(2)	(8)		(7)
Amortization of:
Actuarial (gain) loss	0		1	1		2
Net periodic defined benefit costs (credits)	1		2	4		6
PPL Electric Utilities Corp [Member]
Amortization of:
Termination benefits	(2)			2
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	3	[2]	9	18	[2]	27
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	5		6	16		19
Interest cost	17		16	50		47
Expected return on plan assets	(21)		(20)	(62)		(61)
Amortization of:
Prior service cost	1		1	3		3
Actuarial (gain) loss	4		8	10		25
Net periodic defined benefit costs (credits)	6		11	17		33
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1		2	3		4
Interest cost	2		2	7		6
Expected return on plan assets	(1)		(2)	(4)		(4)
Amortization of:
Prior service cost	1		1	2		2
Net periodic defined benefit costs (credits)	3		3	8		8
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	2		3	6		9
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	0		1	1		2
Interest cost	4		3	11		10
Expected return on plan assets	(4)		(5)	(14)		(15)
Amortization of:
Prior service cost	1		1	2		2
Actuarial (gain) loss	1		3	4		10
Net periodic defined benefit costs (credits)	2		3	4		9
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	$ 2		$ 4	$ 6		$ 13

[1] See Note 10 for details of a one-time voluntary retirement window offered to certain bargaining unit employees.

[2] For PPL Energy Supply and PPL Electric,the three months ended September 30, 2014 include $(5) million and $(2) million and the nine months ended September 30, 2014 include $11 million and $2million of termination benefits related to a one-time voluntary retirement window offered to certain bargaining unit employees. See Note 10 for additional information.