Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
Medium Term Notes Three Point Zero Percent due Two Thousand Twenty Seven [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 375
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Eight [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 325
Debt Instrument, Interest Rate, Stated Percentage	4.05%
Medium Term Notes Three Point Two Five Percent due Two Thousand Twenty Three [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 325
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Medium Term Notes Three Point Six Five Percent due Two Thousand Twenty Eight [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 325
Debt Instrument, Interest Rate, Stated Percentage	3.65%
Medium Term Notes Five Point Three Zero Percentage Due On Two Thousand Eighteen [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 400
Medium Term Notes Five Point Three Zero Percentage Due On Two Thousand Eighteen [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Medium Term Notes Two Point Three Zero Percent Due In Two Thousand Eighteen [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.30%
Repayments of Long-term Debt	$ 350
Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] \| Power [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 700
Debt Instrument, Interest Rate, Stated Percentage	3.85%

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=64930739&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=64930785&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=98514028&loc=d3e3291-108585

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