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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 |

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