Amount Deposited With IRS To Defray Potential Interest Costs

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Estimate of tax interest potentially payable in current year from two thousand four through two thousand six tax years high estimate

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Estimate of tax interest potentially payable in current year from two thousand seven through two thousand ten tax years high estimate

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Financial statement tax reserves

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Tax and interest deficiency

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Tax deduction for the accrued deficiency interest

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Unrecognized tax benefit potential decrease on settlement with IRS

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Unrecognized tax benefit potential increase on settlement with IRS

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Commitments And Contingent Liabilities (Leveraged Lease Investments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
PSEG [Member]
Site Contingency [Line Items]
Unrecognized tax benefit potential increase on settlement with IRS		$ (175)
Financial statement tax reserves		246
Unrecognized tax benefit decrease on settlement with IRS		71	71
Amount deposited with IRS to defray potential interest costs		320
Tax And Interest Deficiency	4
PSEG To IRS [Member]
Site Contingency [Line Items]
Estimate of tax interest potentially payable in current year from 2004 through 2006 tax years high estimate		620
IRS To PSEG [Member]
Site Contingency [Line Items]
Estimate of tax interest potentially payable in current year from 2007 through two 2010 years high estimate		676
IRS [Member]
Site Contingency [Line Items]
Tax deduction for the accrued deficiency interest		$ 100