Changes In Capitalization (Detail) - PSE And G [Member] - USD ($) $ in Millions	1 Months Ended
Jan. 31, 2016	Mar. 31, 2016
Medium Term Notes One Point Nine Zero Percent Due in Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Issued long-term debt		$ 300
Stated interest rate of debt instrument		1.90%
Medium Term Notes Three Point Eight Zero Percent due Two Thousand Forty Six [Member]
Debt Instrument [Line Items]
Issued long-term debt		$ 550
Stated interest rate of debt instrument		3.80%
First And Refunding Mortgage Bonds Six Point Seven Five Percentage Due On Two Thousand Sixteen [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument		6.75%
Repayments of long-term debt	$ 171

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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