Defined Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Defined benefit plans - funding			$ 36	$ 56
Pension Plan [Member] | U.S.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 15	$ 15	28	28
Interest cost	29	36	61	74
Expected return on plan assets	(66)	(63)	(127)	(123)
Amortization of: [Abstract]
Prior service cost	2	2	4	4
Actuarial loss	24	24	49	44
Net periodic defined benefit costs (credits)	4	14	15	27
Pension Plan [Member] | U.K.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	31	21	56	44
Interest cost	33	35	62	71
Expected return on plan assets	(207)	(151)	(384)	(309)
Amortization of: [Abstract]
Prior service cost	0	0	0	0
Actuarial loss	62	52	116	106
Net periodic defined benefit costs (credits)	(81)	(43)	(150)	(88)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	3	3
Interest cost	4	5	8	10
Expected return on plan assets	(7)	(6)	(12)	(11)
Amortization of: [Abstract]
Prior service cost	1	1	1	1
Net periodic defined benefit costs (credits)	(1)	1	0	3
WPD
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Defined benefit plans - funding			124
PPL Electric Utilities Corp [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Defined benefit plans - funding			21	21
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	2	3	2	6
Louisville Gas And Electric Co [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Defined benefit plans - funding			2	5
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)	2	1	5
Kentucky Utilities Co [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Defined benefit plans - funding			1	1
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)	$ 0	$ (1)	$ 1