Financial Risk Management Activities (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Percent of gross margin, less than	1.00%
Aggregate amount of accumulated other comprehensive income (loss) attributed to interest rate derivatives designated as cash flow hedges	$ (1)	$ (2)
Net cash collateral received in connection with net derivative contracts	2	2
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	91	98
Additional collateral aggregate fair value	691	654
PSEG [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	303
Number of interest rate swaps outstanding, total	7
Aggregate amount of series of interest rate swaps converting to variable-rate debt	850
Fair value of interest rate swaps designated as underlying hedges	38	57
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	39	61
Additional collateral aggregate fair value	52	37
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges	19	22	25
PSEG [Member] | Senior Notes 5.5% Due December 2015 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	300
Stated interest rate of debt instrument	5.50%
PSEG [Member] | Senior Notes 5.32% Due September 2016 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	300
Stated interest rate of debt instrument	5.32%
PSEG [Member] | Senior Notes 2.75% Due September 2016 [Member]
Derivatives, Fair Value [Line Items]
Senior Notes converted into variable rate debt	250
Stated interest rate of debt instrument	2.75%
Power [Member]
Derivatives, Fair Value [Line Items]
Amount of after-tax gains on derivatives designated and effective as cash flow hedges expected to be reclassified to earnings during the 12 months following period end	1
Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	(3)
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts	5	5
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net cash collateral received in connection with net derivative contracts		$ (3)