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Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) $ in Millions | 9 Months Ended
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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

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