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Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) $ in Millions | 6 Months Ended
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Jun. 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 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%
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%

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