Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2016 USD ($)
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%
Medium Term Notes Two Point Two Five Percent due Two Thousand Twenty Six [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument	2.25%
Proceeds from Issuance of Long-term Debt	$ 425
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
Pollution Control Bonds [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	100
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%
Senior Notes Five Point Three Two Percentage Due Two Thousand Sixteen [Member] \| Power [Member]
Debt Instrument [Line Items]
Issued long-term debt	$ 303
Stated interest rate of debt instrument	5.32%
Senior Notes Two Point Seven Five Percentage Due Two Thousand Sixteen [Member] \| Power [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument	2.75%
Repayments of long-term debt	$ 250

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
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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))
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Paragraph 14
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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