Financing Receivables (Schedule Of Credit Risk Profile Based On Payment Activity) (Detail) - PSE And G [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Concentration Risk [Line Items]
Credit Risk Profile Based on Payment Activity	$ 193	$ 201
Commercial/Industrial [Member]
Concentration Risk [Line Items]
Credit Risk Profile Based on Payment Activity	180	188
Residential [Member]
Concentration Risk [Line Items]
Credit Risk Profile Based on Payment Activity	$ 13	$ 13

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

Name:	us-gaap_LoansReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant