Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
Jul. 31, 2016	Jun. 30, 2016
Medium Term Notes One Point Nine Zero Percent Due in Two Thousand Twenty One [Member] \| PSE And G [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] \| PSE And G [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] \| PSE And G [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument		6.75%
Repayments of long-term debt		$ 171
Senior Notes Three Point Zero Percent Due In Two Thousand Twenty One [Member] \| Power [Member]
Debt Instrument [Line Items]
Issued long-term debt		$ 700
Stated interest rate of debt instrument		3.00%
Subsequent Event [Member] \| First And Refunding Mortgage Bonds Six Point Seven Five Percentage Due On Two Thousand Sixteen [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 100

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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Contractual interest rate for funds borrowed, under the debt agreement.

+ 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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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ 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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