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Changes In Capitalization (Detail) - PSE And G [Member] - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jan. 31, 2016 | Mar. 31, 2016
Medium Term Notes One Point Nine Zero Percent Due in Two Thousand Twenty One [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] |  |
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] |  |
Debt Instrument [Line Items] |  |
Stated interest rate of debt instrument |  | 6.75%
Repayments of long-term debt | $ 171 |

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