Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Details) (USD $) In Millions	Jun. 30, 2011
Power [Member] | Investment Grade- External Rating [Member]
Current Exposure	$ 437
Securities held as Collateral	33
Net Exposure	431
Number of Counterparties greater than 10%	3
Net Exposure of Counterparties greater than 10%	289	[1]
Power [Member] | Non-Investment Grade- External Rating [Member]
Current Exposure	20
Securities held as Collateral	0
Net Exposure	20
Number of Counterparties greater than 10%	0
Net Exposure of Counterparties greater than 10%	0
Power [Member] | Investment Grade- No External Rating [Member]
Current Exposure	11
Securities held as Collateral	0
Net Exposure	11
Number of Counterparties greater than 10%	0
Net Exposure of Counterparties greater than 10%	0
Power [Member] | Non-Investment Grade- No External Rating [Member]
Current Exposure	0
Securities held as Collateral	0
Net Exposure	0
Number of Counterparties greater than 10%	0
Net Exposure of Counterparties greater than 10%	0
Power [Member]
Current Exposure	468
Securities held as Collateral	33
Net Exposure	462
Number of Counterparties greater than 10%	3
Net Exposure of Counterparties greater than 10%	289
PSE&G [Member]
Net Exposure	151
Nonaffiliated [Member]
Net Exposure	$ 138

[1] Includes net exposure of $151 million with PSE&G. The remaining net exposure of $138 million is with two nonaffiliated power purchasers which are regulated investment grade counterparties.