Other Income (Expense)- net Other Income (Expense) - net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Expense
Economic foreign currency exchange contracts	$ 112	$ 43
Charitable Contributions	4	4
Miscellaneous	1	11
Total Other Expense	117	58
Other Income [Line Items]
Defined benefit plans - non-service credits	68	38
Allowance for Funds Used During Construction - equity component	5	2
Miscellaneous	1	9
Total Other Income	74	49
Other Income (Expense) - net	(43)	(9)
PPL Electric Utilities Corp [Member]
Other Expense
Charitable Contributions	1	1
Defined benefit plans - non-service costs	0	1
Total Other Expense	1	2
Other Income [Line Items]
Defined benefit plans - non-service credits	2	0
Allowance for Funds Used During Construction - equity component	5	2
Total Other Income	7	2
Other Income (Expense) - net	$ 6	$ 0