Other Income (Expense) - net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income [Line Items]
Economic foreign currency exchange contracts	$ (14)	$ 150	$ (261)
Defined benefit plans - non-service credits	316	257	167
Interest income	16	6	2
Allowance for funds used during construction - equity component	23	21	16
Miscellaneous	7	6	17
Total Other Income	348	440	(59)
Other Expense [Line Items]
Charitable contributions	17	24	8
Miscellaneous	22	20	21
Total Other Expense	39	44	29
Other Income (Expense) - net	309	396	(88)
PPL Electric Utilities Corp [Member]
Other Income [Line Items]
Defined benefit plans - non-service credits	4	5	1
Interest income	2	2	1
Allowance for funds used during construction - equity component	23	20	15
Total Other Income	29	27	17
Other Expense [Line Items]
Charitable contributions	3	3	2
Miscellaneous	1	1	3
Total Other Expense	4	4	5
Other Income (Expense) - net	$ 25	$ 23	$ 12