Defined Benefits (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		$ 16		$ 20	$ 49		$ 76
Interest cost		44		42	131		152
Expected return on plan assets		(57)		(56)	(171)		(201)
Amortization of: [Abstract]
Prior service cost		2		1	6		5
Actuarial loss		12		18	37		65
Net periodic defined benefit costs (credits) before settlements		17		25	52		97
Settlements		3		0	3		0
Net periodic defined benefit costs (credits)	[1]	20		25	55		97
Net period defined benefit costs reflected in discontinued operations allocated from PPL's plans to PPL Energy Supply prior to the spinoff							18
Pension Benefits United States [Member] | LKE [Member]
Defined Benefits [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount					66
Pension Benefits United States [Member] | LGE [Member]
Defined Benefits [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount					35
Pension Benefits United Kingdom [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		17	[2]	21	53	[2]	60
Interest cost		58	[2]	80	182	[2]	236
Expected return on plan assets		(124)	[2]	(133)	(389)	[2]	(393)
Amortization of: [Abstract]
Prior service cost		0		0	0		0
Actuarial loss		34	[2]	39	107	[2]	118
Net periodic defined benefit costs (credits) before settlements		(15)	[2]	7	(47)	[2]	21
Settlements		0		0	0		0
Net periodic defined benefit costs (credits)	[1]	(15)	[2]	7	(47)	[2]	21
Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		2		2	6		9
Interest cost		6		6	19		20
Expected return on plan assets		(6)		(6)	(17)		(20)
Amortization of: [Abstract]
Actuarial loss		1		0	1		0
Net periodic defined benefit costs (credits)		3		2	9		9
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		6		8	17		24
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount					66
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		6		7	18		20
Interest cost		18		17	53		51
Expected return on plan assets		(23)		(22)	(68)		(66)
Amortization of: [Abstract]
Prior service cost		2		1	6		5
Actuarial loss		5		9	15		26
Net periodic defined benefit costs (credits)		8		12	24		36
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member] | LGE [Member]
Defined Benefits [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount					35
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		1		1	3		4
Interest cost		2		2	7		7
Expected return on plan assets		(2)		(1)	(5)		(4)
Amortization of: [Abstract]
Prior service cost		1		1	2		2
Net periodic defined benefit costs (credits)		2		3	7		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		2		3	7		10
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Defined Benefits [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount					35
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		0		0	1		1
Interest cost		4		3	11		10
Expected return on plan assets		(5)		(5)	(15)		(15)
Amortization of: [Abstract]
Prior service cost		1		1	3		2
Actuarial loss		2		3	5		9
Net periodic defined benefit costs (credits)		2		2	5		7
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	$ 8		$ 13

[1] For the nine months ended September 30, 2015, the total net periodic defined benefit cost includes $18 million reflected in discontinued operations related to costs allocated from PPL's plans to PPL Energy Supply prior to the spinoff.

[2] See Note 2 for a discussion of changes to the discount rate used for the U.K. Pension Plans.