CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) $ in Millions	12 Months Ended
Dec. 31, 2017 vote	Dec. 31, 2016 vote	Dec. 31, 2015 USD ($) vote
Vote per share of PPL's common stock \| vote	1	1	1
PPL Electric Utilities Corp [Member]
Non-cash contributions related to remeasurement and separation of benefit plans \| $			$ 56

Amount of non-cash contributions related to the remeasurement and separation of pension and postretirement benefit plans with the spinoff entity, which impacted the subsidiaries allocated net benefit obligation from the parent.

No definition available.

Name:	ppl_CapitalContributionsFromParentNonCash
Namespace Prefix:	ppl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration