Other Income (Expense) - net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income
Defined benefit plans - non-service credits	$ 4	$ 1
AFUDC - equity component	4	3
Miscellaneous	0	1
Total Other Income	8	5
Other Expense
Charitable Contributions	1	1
Miscellaneous	7	9
Total Other Expense	8	10
Other Income (Expense) - net	0	(5)
PPL Electric Utilities Corp [Member]
Other Expense
Other Income (Expense) - net	$ 5	$ 3