Interim Financial Statements (Details) (PPL Energy Supply LLC [Member], 2014 Energy Related Businesses Adjustment [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2014
PPL Energy Supply LLC [Member] \| 2014 Energy Related Businesses Adjustment [Member]
Prior Period Adjustment (Numeric) [Line Items]
Out of period adjustment amount, pre-tax	$ 14	$ 17
Out of period adjustment amount, after-tax	$ 9	$ 11

Amount of each individual error being corrected in the correcting adjustment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 1.N.Q3)

-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 1

-Section N

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration