Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Power [Member]
Loss Contingencies [Line Items]
Face Value of Outstanding Guarantees	$ 1,786	$ 1,734
Exposure under Current Guarantees	183	172
Letters of Credit Margin Posted	169	122
Letters of Credit Margin Received	220	192
Counterparty Cash Margin Deposited	0	0
Counterparty Cash Margin Received	(17)	(15)
Net Broker Balance Deposited (Received)	1	(5)
Additional Collateral that could be Required	851	864
Liquidity Available under PSEG’s and Power’s Credit Facilities to Post Collateral	3,391	3,215
Other Letters of Credit	51	$ 51
Pse And G [Member]
Loss Contingencies [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	14
Line of Credit Facility, Remaining Borrowing Capacity	615
PennEast Natural Gas Pipeline [Member] | Power [Member]
Loss Contingencies [Line Items]
Face Value of Outstanding Guarantees	106
755 MW Gas-Fired Combined Cycle Generating Station [Member] | Power [Member]
Loss Contingencies [Line Items]
Face Value of Outstanding Guarantees	$ 21