Schedule Of Consolidated Debt (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	$ 8,078
Amounts Due Within One Year	(417)		(915)
Nonrecourse project debt	50
PSEG [Member]
Debt Instrument [Line Items]
Fair Value of Swaps	62		39
Net Unamortized Discount	(23)		(29)
Long-Term Debt, Total	39		10
Power [Member]
Debt Instrument [Line Items]
Net Unamortized Discount	(16)		(18)
Long-Term Debt, Total	2,685		2,805
Long-term Debt, Carrying Amount	2,767		3,473
Amounts Due Within One Year	(66)		(650)
PSE&G [Member]
Debt Instrument [Line Items]
Net Unamortized Discount	(7)		(8)
Long-Term Debt, Total	4,693		4,958
Long-term Debt, Carrying Amount	4,277		4,291
Amounts Due Within One Year	(300)		(264)
PSE&G (Excluding Transition Funding and Transition Funding II) [Member]
Debt Instrument [Line Items]
Long-Term Debt, Total	3,970		4,019
Energy Holdings [Member]
Debt Instrument [Line Items]
Long-Term Debt, Total	44		46
Long-term Debt, Carrying Amount	95		47
Amounts Due Within One Year	51		1
Senior Notes 7.75% Due On 2011 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	0		606
Stated interest rate of debt instrument	7.75%
Debt instrument maturity year	2011
Senior Notes 6.95% Due On 2012 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	0		600
Stated interest rate of debt instrument	6.95%
Debt instrument maturity year	2012
Senior Notes 2.50% Due On 2013 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	300		300
Stated interest rate of debt instrument	2.50%
Debt instrument maturity year	2013
Senior Notes 5.00% Due On 2014 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		250
Stated interest rate of debt instrument	5.00%
Debt instrument maturity year	2014
Senior Notes 5.50% Due On 2015 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	300		300
Stated interest rate of debt instrument	5.50%
Debt instrument maturity year	2015
Senior Notes 5.32% Due On 2016 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	303		303
Stated interest rate of debt instrument	5.32%
Debt instrument maturity year	2016
Senior Notes 2.75% Due On 2016 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		0
Stated interest rate of debt instrument	2.75%
Debt instrument maturity year	2016
Senior Notes 5.13% Due On 2020 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	406		406
Stated interest rate of debt instrument	5.13%
Debt instrument maturity year	2020
Senior Notes 4.15% Due On 2021 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		0
Stated interest rate of debt instrument	4.15%
Debt instrument maturity year	2021
Senior Notes 8.63% Due On 2031 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	500		500
Stated interest rate of debt instrument	8.63%
Debt instrument maturity year	2031
Senior Notes [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	2,559		3,265
Pollution Control Notes Floating Rate Due On 2014 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	44		44
Debt instrument maturity year	2014
Pollution Control Notes 5.00% Due On 2012 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	66		66
Stated interest rate of debt instrument	5.00%
Debt instrument maturity year	2012
Pollution Control Notes 5.50% Due On 2020 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	14		14
Stated interest rate of debt instrument	5.50%
Debt instrument maturity year	2020
Pollution Control Notes 5.85% Due On 2027 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	19		19
Stated interest rate of debt instrument	5.85%
Debt instrument maturity year	2027
Pollution Control Notes 5.75% Due On 2031 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	25		25
Stated interest rate of debt instrument	5.75%
Debt instrument maturity year	2031
Pollution Control Notes 5.75% Due On 2037 [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	40		40
Stated interest rate of debt instrument	5.75%
Debt instrument maturity year	2037
Pollution Control Notes [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	208		208
First And Refunding Mortgage Bonds 6.75% Due On 2016 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	171		171
Stated interest rate of debt instrument	6.75%
Debt instrument maturity year	2016
First And Refunding Mortgage Bonds 9.25% Due On 2021 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	134		134
Stated interest rate of debt instrument	9.25%
Debt instrument maturity year	2021
First And Refunding Mortgage Bonds 8.00% Due On 2037 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	7		7
Stated interest rate of debt instrument	8.00%
Debt instrument maturity year	2037
First And Refunding Mortgage Bonds 5.00% Due On 2037 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	8		8
Stated interest rate of debt instrument	5.00%
Debt instrument maturity year	2037
First And Refunding Mortgage Bonds [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	320		320
Pollution Control Bonds 5.20% Due On 2025 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	23		23
Stated interest rate of debt instrument	5.20%
Debt instrument maturity year	2025
Pollution Control Bonds 0.95% Due On 2028-2033 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	0		164
Stated interest rate of debt instrument	0.95%
Debt instrument maturity year	2028 - 2033
Pollution Control Bonds 1.20% Due On 2031 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	0		100
Stated interest rate of debt instrument	1.20%
Debt instrument maturity year	2031
Pollution Control Bonds 5.45% Due On 2032 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	50		50
Stated interest rate of debt instrument	5.45%
Debt instrument maturity year	2032
Pollution Control Bonds [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	73		337
Medium-Term Notes 5.13% Due On 2012 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	300		300
Stated interest rate of debt instrument	5.13%
Debt instrument maturity year	2012
Medium-Term Notes 5.00% Due On 2013 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	150		150
Stated interest rate of debt instrument	5.00%
Debt instrument maturity year	2013
Medium-Term Notes 5.38% Due On 2013 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	300		300
Stated interest rate of debt instrument	5.38%
Debt instrument maturity year	2013
Medium-Term Notes 6.33% Due On 2013 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	275		275
Stated interest rate of debt instrument	6.33%
Debt instrument maturity year	2013
Medium-Term Notes 0.85% Due On 2014 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		0
Stated interest rate of debt instrument	0.85%
Debt instrument maturity year	2014
Medium-Term Notes 5.00% Due On 2014 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		250
Stated interest rate of debt instrument	5.00%
Debt instrument maturity year	2014
Medium-Term Notes 2.70% Due On 2015 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	300		300
Stated interest rate of debt instrument	2.70%
Debt instrument maturity year	2015
Medium-Term Notes 5.30% Due On 2018 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	400		400
Stated interest rate of debt instrument	5.30%
Debt instrument maturity year	2018
Medium-Term Notes 7.04% Due On 2020 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	9		9
Stated interest rate of debt instrument	7.04%
Debt instrument maturity year	2020
Medium-Term Notes 3.50% Due On 2020 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		250
Stated interest rate of debt instrument	3.50%
Debt instrument maturity year	2020
Medium-Term Notes 5.25% Due On 2035 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		250
Stated interest rate of debt instrument	5.25%
Debt instrument maturity year	2035
Medium-Term Notes 5.70% Due On 2036 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		250
Stated interest rate of debt instrument	5.70%
Debt instrument maturity year	2036
Medium-Term Notes 5.80% Due On 2037 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	350		350
Stated interest rate of debt instrument	5.80%
Debt instrument maturity year	2037
Medium-Term Notes 5.38% Due On 2039 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	250		250
Stated interest rate of debt instrument	5.38%
Debt instrument maturity year	2039
Medium-Term Notes 5.50% Due On 2040 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	300		300
Stated interest rate of debt instrument	5.50%
Debt instrument maturity year	2040
Total Medium Term Notes [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	3,884		3,634
Non-Recourse Project Debt, Resources 5.00% - 8.75% Due 2010 - 2020 [Member] | Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	45		46
Debt instrument maturity year	2010-2020
Non Recourse Project Debt, Other Resources Due 2012 [Member] | Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	50		0
Debt instrument maturity year	2012
Non Recourse Project Debt, EGDC 8.27% Due 2010 - 2011 [Member] | Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	0		1
Debt instrument maturity year	2010-2011
Transition Funding (PSE&G) [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	895		1,090
Amounts Due Within One Year	205		195
Transition Funding (PSE&G) [Member] | Securitization Bonds 6.45% Due On 2010-2011 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	0		46
Stated interest rate of debt instrument	6.45%
Debt instrument maturity year	2010-2011
Transition Funding (PSE&G) [Member] | Securitization Bonds 6.61% Due On 2011-2013 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	305		454
Stated interest rate of debt instrument	6.61%
Debt instrument maturity year	2011-2013
Transition Funding (PSE&G) [Member] | Securitization Bonds 6.75% Due On 2013-2014 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	220		220
Stated interest rate of debt instrument	6.75%
Debt instrument maturity year	2013-2014
Transition Funding (PSE&G) [Member] | Securitization Bonds 6.89% Due On 2014-2015 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	370		370
Stated interest rate of debt instrument	6.89%
Debt instrument maturity year	2014-2015
Transition Funding (PSE&G) [Member] | Transition Funding PSE&G [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-Term Debt, Total	690		895
Transition Funding II (PSE&G) [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	33		44
Transition Funding II (PSE&G) [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	44		55
Amounts Due Within One Year	(11)		(11)
Transition Funding II (PSE&G) [Member] | Securitization Bonds 4.34% Due On 2010-2012 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	1		12
Stated interest rate of debt instrument	4.34%
Debt instrument maturity year	2010-2012
Transition Funding II (PSE&G) [Member] | Securitization Bonds 4.49% Due On 2012-2013 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	20		20
Stated interest rate of debt instrument	4.49%
Debt instrument maturity year	2012-2013
Transition Funding II (PSE&G) [Member] | Securitization Bonds 4.57% Due On 2013-2015 [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	23		23
Stated interest rate of debt instrument	4.57%
Debt instrument maturity year	2013-2015
Resourse Debt [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	2,751		3,455
Transition Funding [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	895		1,090
Transition Funding II [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	44		55
Project Level, Non-Recourse Debt [Member] | Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	95	[1]	47	[1]
Non-Recourse Project Debt [Member] | Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	$ 44		$ 46

[1] Fair value amounts as of December 31, 2011 include $50 million of nonrecourse project debt related to Dynegy.