Defined Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	$ 26	$ 31
Interest cost	59	54
Expected return on plan assets	(74)	(74)
Amortization of:
Prior service cost	5	6
Actuarial (gain) loss	7	20
Net periodic defined benefit costs (credits)	23	37
Pension Benefits United Kingdom [Member]
Defined Benefits [Line Items]
Service cost	18	18
Interest cost	88	81
Expected return on plan assets	(130)	(118)
Amortization of:
Prior service cost
Actuarial (gain) loss	33	38
Net periodic defined benefit costs (credits)	9	19
Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	3	4
Interest cost	8	7
Expected return on plan assets	(6)	(6)
Amortization of:
Prior service cost
Actuarial (gain) loss		1
Net periodic defined benefit costs (credits)	5	6
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	7	11
PPL Energy Supply LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1	2
Interest cost	2	2
Expected return on plan assets	(2)	(3)
Amortization of:
Actuarial (gain) loss		1
Net periodic defined benefit costs (credits)	1	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	5	9
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	6	7
Interest cost	17	16
Expected return on plan assets	(20)	(21)
Amortization of:
Prior service cost	1	1
Actuarial (gain) loss	3	8
Net periodic defined benefit costs (credits)	7	11
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	1	1
Interest cost	2	2
Expected return on plan assets	(1)	(1)
Amortization of:
Prior service cost	1	1
Net periodic defined benefit costs (credits)	3	3
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
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost		1
Interest cost	4	3
Expected return on plan assets	(5)	(5)
Amortization of:
Prior service cost	1	1
Actuarial (gain) loss	1	3
Net periodic defined benefit costs (credits)	1	3
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	$ 3	$ 4