Available-For-Sale Securities (Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 1,734		$ 1,701
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	56	[1]	30	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1	[1]	2	[1]
Fair Value	904		897
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0	[1]	0	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(3)	[1]	(2)	[1]
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	269	[2]	300	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4	[2]	1	[2]
Fair Value	460		429
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0	[2]	(1)	[2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(7)	[2]	(11)	[2]
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	91	[3]	107	[3]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3	[3]	3	[3]
Fair Value	315		291
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0	[3]	0	[3]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(2)	[3]	(4)	[3]
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	775		720
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	55		84
Rabbi Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	55		65
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3		3
Fair Value	183		179
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(2)		(3)
Rabbi Trust [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	[4]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	[4]	0	[4]
Fair Value	21		23
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0	[4]	0	[4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	0	[4]	0	[4]
Rabbi Trust [Member] | Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	42	[5]	47	[5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2	[5]	2	[5]
Fair Value	109		107
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0	[5]	0	[5]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(1)	[5]	(2)	[5]
Rabbi Trust [Member] | Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	13	[6]	18	[6]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1	[6]	1	[6]
Fair Value	46		46
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0	[6]	0	[6]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(1)	[6]	(1)	[6]
Rabbi Trust [Member] | Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	55		65
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3		3
Fair Value	155		153
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(2)		(3)
Rabbi Trust [Member] | Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	7		3
Rabbi Trust [Member] | Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	43		39
Unrealized Loss Position Less Than 12 Months [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	416		437
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(12)		(17)
Unrealized Loss Position Less Than 12 Months [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	360		407
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months Aggregate Losses Accumulated in Investments	(9)		(15)
Unrealized Loss Position Greater Than 12 Months [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	8		6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	0		(1)
Unrealized Loss Position Greater Than 12 Months [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	7		4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer Aggregate Losses Accumulated in Investments	$ 0		$ (1)

[1] Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. The unrealized losses are distributed over a broad range of securities with limited impairment durations. Power does not consider these securities to be other-than-temporarily impaired as of March 31, 2014.

[2] Debt Securities (Government)—Unrealized losses on Power’s NDT investments in United States Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the United States government or an agency of the United States government, it is not expected that these securities will settle for less than their amortized cost basis, since Power does not intend to sell nor will it be more-likely-than-not required to sell. Power does not consider these securities to be other-than-temporarily impaired as of March 31, 2014.

[3] Debt Securities (Corporate)—Power’s investments in corporate bonds are limited to investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since Power does not intend to sell these securities nor will it be more-likely-than-not required to sell, Power does not consider these debt securities to be other-than-temporarily impaired as of March 31, 2014.

[4] Equity Securities—Investments in marketable equity securities within the Rabbi Trust Fund are through a mutual fund which invests primarily in common stocks within a broad range of industries and sectors. PSEG does not consider these securities to be other-than-temporarily impaired as of March 31, 2014.

[5] Debt Securities (Government)—Unrealized losses on PSEG’s Rabbi Trust investments in United States Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. Since these investments are guaranteed by the United States government or an agency of the United States government, it is not expected that these securities will settle for less than their amortized cost basis, since PSEG does not intend to sell nor will it be more-likely-than-not required to sell. PSEG does not consider these securities to be other-than-temporarily impaired as of March 31, 2014.

[6] Debt Securities (Corporate)—PSEG’s investments in corporate bonds are primarily in investment grade securities. It is not expected that these securities would settle for less than their amortized cost. Since PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell, PSEG does not consider these debt securities to be other-than-temporarily impaired as of March 31, 2014.