Defined Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	$ 31	$ 25	$ 94	$ 77
Interest cost	53	55	160	165
Expected return on plan assets	(73)	(65)	(220)	(195)
Amortization of:
Prior service cost	6	6	17	18
Actuarial (gain) loss	20	11	60	32
Net periodic defined benefit costs (credits)	37	32	111	97
Pension Benefits - U.K. [Member]
Defined Benefits [Line Items]
Service cost	18	13	52	40
Interest cost	79	85	238	254
Expected return on plan assets	(115)	(115)	(346)	(340)
Amortization of:
Prior service cost		1		3
Actuarial (gain) loss	37	19	112	59
Net periodic defined benefit costs (credits)	19	3	56	16
Other Postretirement Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	4	3	11	9
Interest cost	7	7	21	23
Expected return on plan assets	(6)	(6)	(18)	(17)
Amortization of:
Transition obligation				1
Prior service cost		1		1
Actuarial (gain) loss	1	1	4	3
Net periodic defined benefit costs (credits)	6	6	18	20
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	11	10	34	29
PPL Energy Supply LLC [Member] | Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	1	1	5	4
Interest cost	2	2	6	6
Expected return on plan assets	(2)	(2)	(7)	(7)
Amortization of:
Actuarial (gain) loss	1	1	2	2
Net periodic defined benefit costs (credits)	2	2	6	5
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	8	27	23
LG And E And KU Energy LLC [Member] | Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	6	5	19	16
Interest cost	16	16	47	48
Expected return on plan assets	(20)	(17)	(61)	(52)
Amortization of:
Prior service cost	1	2	3	4
Actuarial (gain) loss	8	5	25	16
Net periodic defined benefit costs (credits)	11	11	33	32
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	2	1	4	3
Interest cost	2	3	6	7
Expected return on plan assets	(2)	(1)	(4)	(3)
Amortization of:
Transition obligation				1
Prior service cost	1		2	2
Actuarial (gain) loss				(1)
Net periodic defined benefit costs (credits)	3	3	8	9
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	9	9
Louisville Gas And Electric Co [Member] | Pension Benefits - U.S. [Member]
Defined Benefits [Line Items]
Service cost	1		2	1
Interest cost	3	4	10	11
Expected return on plan assets	(5)	(5)	(15)	(14)
Amortization of:
Prior service cost	1	1	2	2
Actuarial (gain) loss	3	3	10	8
Net periodic defined benefit costs (credits)	3	3	9	8
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	$ 4	$ 13	$ 13