Defined Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	$ 32	$ 26	$ 63	$ 52
Interest cost	53	54	107	110
Expected return on plan assets	(73)	(64)	(147)	(130)
Amortization of:
Prior service cost	5	6	11	12
Actuarial (gain) loss	20	11	40	21
Net periodic defined benefit costs (credits)	37	33	74	65
Pension Benefits - U.K. [Member]
Defined Benefits [Line Items]
Service cost	16	14	34	27
Interest cost	78	85	159	169
Expected return on plan assets	(113)	(114)	(231)	(225)
Amortization of:
Prior service cost		1		2
Actuarial (gain) loss	37	20	75	40
Net periodic defined benefit costs (credits)	18	6	37	13
Other Postretirement Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	3	3	7	6
Interest cost	7	8	14	16
Expected return on plan assets	(6)	(5)	(12)	(11)
Amortization of:
Transition obligation				1
Actuarial (gain) loss	2	1	3	2
Net periodic defined benefit costs (credits)	6	7	12	14
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	12	9	23	19
PPL Energy Supply LLC [Member] | Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	2	2	4	3
Interest cost	2	2	4	4
Expected return on plan assets	(2)	(3)	(5)	(5)
Amortization of:
Actuarial (gain) loss			1	1
Net periodic defined benefit costs (credits)	2	1	4	3
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	9	7	18	15
LG And E And KU Energy LLC [Member] | Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	6	5	13	11
Interest cost	15	15	31	32
Expected return on plan assets	(20)	(17)	(41)	(35)
Amortization of:
Prior service cost	1	1	2	2
Actuarial (gain) loss	9	6	17	11
Net periodic defined benefit costs (credits)	11	10	22	21
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	1	1	2	2
Interest cost	2	2	4	4
Expected return on plan assets	(1)	(1)	(2)	(2)
Amortization of:
Transition obligation		1		1
Prior service cost		1	1	2
Actuarial (gain) loss		(1)		(1)
Net periodic defined benefit costs (credits)	2	3	5	6
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	3	3	6	6
Louisville Gas And Electric Co [Member] | Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost		1	1	1
Interest cost	4	3	7	7
Expected return on plan assets	(5)	(4)	(10)	(9)
Amortization of:
Prior service cost			1	1
Actuarial (gain) loss	4	2	7	5
Net periodic defined benefit costs (credits)	3	2	6	5
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	$ 5	$ 5	$ 9	$ 9