Pension, OPEB and Savings Plans (Reconciliations Of The Beginning And Ending Balances Of Pension And OPEB Plans' Level 3 Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		144 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at End of Year	$ 4,610		$ 4,042
Pension And OPEB Plans Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at End of Year	31		73
Temporary Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at End of Year	67	[1]	32	[1]
Temporary Investment Funds [Member] | Pension And OPEB Plans Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at Beginning of Year					23
Purchases/(Sales)			0
Transfer In/ (Out)			(23)	[2]
Actual Return on Asset Sales			0
Actual Return on Assets Still Held			0
Fair Value of Assets at End of Year	0	[1]	0	[1]	23
Commingled Bonds - US [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at End of Year
Commingled Bonds - US [Member] | Pension And OPEB Plans Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at Beginning of Year					8
Purchases/(Sales)			(8)
Transfer In/ (Out)			0	[2]
Actual Return on Asset Sales			0
Actual Return on Assets Still Held			0
Fair Value of Assets at End of Year			0		8
Pooled Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at End of Year			36	[3]
Pooled Real Estate [Member] | Pension And OPEB Plans Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at Beginning of Year	36	[3]			48
Purchases/(Sales)	(38)		(18)
Transfer In/ (Out)	0		0	[2]
Actual Return on Asset Sales	2		1
Actual Return on Assets Still Held	0		5
Fair Value of Assets at End of Year	0		36	[3]	48
Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at End of Year	31	[4]	37	[4]
Private Equity [Member] | Pension And OPEB Plans Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Assets at Beginning of Year	37	[4]			38
Purchases/(Sales)	(6)		(5)
Transfer In/ (Out)	0		0	[2]
Actual Return on Asset Sales	5		7
Actual Return on Assets Still Held	(5)		(3)
Fair Value of Assets at End of Year	$ 31	[4]	$ 37	[4]	$ 38

[1] Certain temporary investment funds are valued using inputs such as time-to-maturity, coupon rate, quality rating and current yield (primarily Level 2).

[2] During the year ended December 31, 2011, $23 million of the temporary investment funds in the Pension and OPEB Fund were transferred from Level 3 to Level 2, due to more observable pricing for the underlying securities. As per PSEG’s policy, this transfer was recognized as of the beginning of the first quarter (i.e. the quarter in which the transfer occurred).

[3] The fair value of real estate investments is based on annual independent appraisals. The investments are also valued internally every quarter by the investment managers based on significant changes in property operations and market conditions (primarily Level 3).

[4] Limited partnership interests in private equity funds are valued using significant unobservable inputs as there is little, if any, market activity. In addition, there may be transfer restrictions on private equity securities. The process for determining the fair value of such securities relied on commonly accepted valuation techniques, including the use of earnings multiples based on comparable public securities, industry-specific non-earnings-based multiples and discounted cash flow models. These inputs require significant management judgment or estimation (primarily Level 3).