Defined Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plan [Member] | U.S.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 13	$ 13
Interest cost	32	38
Expected return on plan assets	(61)	(60)
Amortization of: [Abstract]
Prior service cost	2	2
Actuarial loss	25	20
Net periodic defined benefit costs (credits)	11	13
Pension Plan [Member] | U.K.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	25	23
Interest cost	29	36
Expected return on plan assets	(177)	(158)
Amortization of: [Abstract]
Prior service cost	0	0
Actuarial loss	54	54
Net periodic defined benefit costs (credits)	(69)	(45)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2
Interest cost	4	5
Expected return on plan assets	(5)	(5)
Amortization of: [Abstract]
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	0	3
LG And E And KU Energy LLC [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	5
Interest cost	14	16
Expected return on plan assets	(24)	(24)
Amortization of: [Abstract]
Prior service cost	2	2
Actuarial loss	11	9
Net periodic defined benefit costs (credits)	$ 9	$ 8
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
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
Interest cost	2	2
Expected return on plan assets	(2)	(2)
Amortization of: [Abstract]
Net periodic defined benefit costs (credits)	1	1
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
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	$ 1	$ 1