Defined Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Plan [Member] | U.S.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 15	$ 12	$ 28	$ 25
Interest cost	36	41	74	82
Expected return on plan assets	(63)	(61)	(123)	(122)
Amortization of: [Abstract]
Prior service cost	2	2	4	4
Actuarial loss	24	14	44	27
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements	14	8	27	16
Settlements	0	0	0	1
Net periodic defined benefit costs (credits)	14	8	27	17
Pension Plan [Member] | U.K.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	21	17	44	34
Interest cost	35	48	71	95
Expected return on plan assets	(151)	(150)	(309)	(298)
Amortization of: [Abstract]
Prior service cost	0	0	0	0
Actuarial loss	52	23	106	47
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements	(43)	(62)	(88)	(122)
Settlements	0	0	0	0
Net periodic defined benefit costs (credits)	(43)	(62)	(88)	(122)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	3	2
Interest cost	5	5	10	11
Expected return on plan assets	(6)	(4)	(11)	(9)
Amortization of: [Abstract]
Prior service cost	1	0	1	0
Net periodic defined benefit costs (credits)	1	2	3	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	3	2	6	5
LG And E And KU Energy LLC [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	7	5	12	11
Interest cost	13	17	29	33
Expected return on plan assets	(26)	(26)	(50)	(51)
Amortization of: [Abstract]
Prior service cost	2	2	4	4
Actuarial loss	10	6	19	10
Net periodic defined benefit costs (credits)	6	4	$ 14	$ 7
Regulatory Asset Amortization Period			15 years	15 years
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period	3	1	$ 6	$ 1
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	2	2
Interest cost	2	2	4	4
Expected return on plan assets	(3)	(2)	(5)	(4)
Amortization of: [Abstract]
Prior service cost	0	1	0	1
Actuarial loss	0	(1)	0	(1)
Net periodic defined benefit costs (credits)	0	1	1	2
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	1	5	2
Louisville Gas And Electric Co [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		1		1
Interest cost		3		6
Expected return on plan assets		(5)		(11)
Amortization of: [Abstract]
Prior service cost		2		3
Actuarial loss		1		3
Net periodic defined benefit costs (credits)		2		2
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	$ 0	$ 0	$ 1	$ 0