Changes In Capitalization (Detail)	9 Months Ended
Sep. 30, 2015 USD ($)
Power [Member]
Debt Instrument [Line Items]
Cash dividends paid to parent company	$ 400,000,000
Medium Term Notes Three Point Zero Percent Due In Two Thousand Twenty Five [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Issued long-term debt	$ 350,000,000
Stated interest rate of debt instrument	3.00%
Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Five [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Issued long-term debt	$ 250,000,000
Stated interest rate of debt instrument	4.05%
Medium Term Notes Two Point Seven Zero Percentage Due On Two Thousand Fifteen [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument	2.70%
Repayments of long-term debt	$ 300,000,000
Securitization Debt [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	183,000,000
Transition Fundings Ii Securitization Debt [Member] \| PSE And G [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 8,000,000

This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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