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Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - PSE And G [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | $ 178 | $ 168
Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | 168 | 158
Residential [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | $ 10 | $ 10

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- Definition 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. + References 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 + Details
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