Defined Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	$ 25		$ 32	$ 51		$ 63
Interest cost	58		53	117		107
Expected return on plan assets	(75)		(73)	(149)		(147)
Amortization of:
Prior service cost	5		5	10		11
Actuarial (gain) loss	8		20	15		40
Net periodic defined benefit costs (credits) prior to termination benefits	21		37	44		74
Termination benefits	20	[1]		20	[1]
Net periodic defined benefit costs (credits)	41		37	64		74
Pension Benefits United Kingdom [Member]
Defined Benefits [Line Items]
Service cost	18		16	36		34
Interest cost	90		78	178		159
Expected return on plan assets	(132)		(113)	(262)		(231)
Amortization of:
Prior service cost
Actuarial (gain) loss	33		37	66		75
Net periodic defined benefit costs (credits) prior to termination benefits	9		18	18		37
Net periodic defined benefit costs (credits)	9		18	18		37
Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	3		3	6		7
Interest cost	8		7	16		14
Expected return on plan assets	(7)		(6)	(13)		(12)
Amortization of:
Actuarial (gain) loss			2			3
Net periodic defined benefit costs (credits)	4		6	9		12
PPL Energy Supply LLC [Member]
Amortization of:
Termination benefits	16			16
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	23	[2]	12	30	[2]	23
PPL Energy Supply LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	2		2	3		4
Interest cost	2		2	4		4
Expected return on plan assets	(3)		(2)	(5)		(5)
Amortization of:
Actuarial (gain) loss	1			1		1
Net periodic defined benefit costs (credits)	2		2	3		4
PPL Electric Utilities Corp [Member]
Amortization of:
Termination benefits	4			4
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	10	[2]	9	15	[2]	18
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	5		6	11		13
Interest cost	16		15	33		31
Expected return on plan assets	(21)		(20)	(41)		(41)
Amortization of:
Prior service cost	1		1	2		2
Actuarial (gain) loss	3		9	6		17
Net periodic defined benefit costs (credits)	4		11	11		22
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1		1	2		2
Interest cost	3		2	5		4
Expected return on plan assets	(2)		(1)	(3)		(2)
Amortization of:
Prior service cost				1		1
Net periodic defined benefit costs (credits)	2		2	5		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	2		3	4		6
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1			1		1
Interest cost	3		4	7		7
Expected return on plan assets	(5)		(5)	(10)		(10)
Amortization of:
Prior service cost				1		1
Actuarial (gain) loss	2		4	3		7
Net periodic defined benefit costs (credits)	1		3	2		6
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	$ 1		$ 5	$ 4		$ 9

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

[2] The three and six months ended June 30, 2014 include $16 million and $4 million of termination benefits for PPL Energy Supply and PPL Electric related to a one-time voluntary retirement window offered to certain bargaining unit employees. See Note 10 for additional information.