Commitments And Contingent Liabilities (Capital Expenditures) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Long-term Purchase Commitment [Line Items]
Capital Expenditures	$ 6,400
Total expenditures to date	2,102	1,969
Energy Holdings-Solar [Member]
Long-term Purchase Commitment [Line Items]
Guarantee payment of obligations	10
Power [Member]
Long-term Purchase Commitment [Line Items]
Total expenditures to date	419	493
Payments for Nuclear Fuel	176
Power [Member] | General Plant Assets [Member]
Long-term Purchase Commitment [Line Items]
Total expenditures to date	243
PSE And G [Member]
Long-term Purchase Commitment [Line Items]
Total expenditures to date	1,628	1,369
Payments for Removal Costs	66
Total Capital Expenditures	1,648
Solar Loan Investment [Member] | PSE And G [Member]
Long-term Purchase Commitment [Line Items]
Total expenditures to date	20
Through 2015 [Member] | PSE And G [Member]
Long-term Purchase Commitment [Line Items]
Increase in Projected Capital Expenditures	215
Fiscal Year 2013 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	2,540
Fiscal Year 2013 [Member] | Power [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	400
Fiscal Year 2013 [Member] | PSE And G [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	2,045
Fiscal Year 2013 [Member] | Other Entity [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	95
Fiscal Year 2014 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	2,170
Fiscal Year 2014 [Member] | Power [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	365
Fiscal Year 2014 [Member] | PSE And G [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	1,765
Fiscal Year 2014 [Member] | Other Entity [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	40
Fiscal Year 2015 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	1,640
Fiscal Year 2015 [Member] | Power [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	305
Fiscal Year 2015 [Member] | PSE And G [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	1,305
Fiscal Year 2015 [Member] | Other Entity [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	$ 30