Commitments And Contingent Liabilities (Leveraged Lease Investments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Site Contingency [Line Items]
Amount deposited with IRS to defray potential interest costs	$ 320,000,000
PSEG To IRS [Member]
Site Contingency [Line Items]
Estimate of tax interest potentially payable in current year from 2004 through 2008 tax years high estimate	1,000,000,000
IRS To PSEG [Member]
Site Contingency [Line Items]
Estimate of tax interest potentially payable in current year from 2009 through 2010 tax years high estimate	1,000,000,000
IRS [Member]
Site Contingency [Line Items]
Claims payments	1,000,000,000
Refund of claims	1,000,000,000
Tax deduction for the accrued deficiency interest	$ 100,000,000
Leveraged Lease Investments [Member]
Site Contingency [Line Items]
Penalty percentage proposed for substantial understatement of tax liability	20.00%