New Accounting Guidance Pending Adoption New Accounting Guidance Pending Adoption (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Pension Plan [Member] \| U.K.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated Impact Of The Adoption Of ASU 2017-07	$ 130	$ 90

Estimated impact of the non-service cost components of net periodic benefit costs in a credit position to be reclassified from Other Operation and Maintenance to Other Income (Expense)- net as a result of adopting ASU 2017-07.

No definition available.

Name:	ppl_EstimatedImpactOfAdoptionOfASU201707
Namespace Prefix:	ppl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration