Commitments and Contingent Liabilities (Capital Expenditures) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Long-term Purchase Commitment [Line Items]
Capital Expenditures	$ 6,100
Fiscal Year 2013 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	2,535
Fiscal Year 2014 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	2,085
Fiscal Year 2015 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	1,515
Power [Member] | Fiscal Year 2013 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	400
Power [Member] | Fiscal Year 2014 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	365
Power [Member] | Fiscal Year 2015 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	305
PSE&G [Member] | Fiscal Year 2013 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	2,040
PSE&G [Member] | Fiscal Year 2014 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	1,680
PSE&G [Member] | Fiscal Year 2015 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	1,180
Other [Member] | Fiscal Year 2013 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	95
Other [Member] | Fiscal Year 2014 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	40
Other [Member] | Fiscal Year 2015 [Member]
Long-term Purchase Commitment [Line Items]
Capital Expenditures	$ 30