Trust Investments (Value Of Securities That Have Been In An Unrealized Loss Position For Less Than And Greater Than 12 Months) (Detail) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value		$ 164	$ 479
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses		(15)	(59)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value		439	549
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		(14)	(24)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value		6	68
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses		0	(3)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value		57	88
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		(1)	(3)
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[1]	121	278
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[1]	(15)	(54)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[1]	24	10
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[1]	(7)	(5)
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		43	201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		415	539
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		7	19
Total Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		6	68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		57	88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			3
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	[2]	20	150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[2]	0	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	[2]	190	222
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[2]	4	10
Corporate Debt Obligations [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	[3]	6	50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[3]	0	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	[3]	30	29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[3]	1	1
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	[4]	23	51
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[4]	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	[4]	225	317
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[4]	3	9
Government Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	[5]	0	18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[5]	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	[5]	27	59
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[5]	0	2
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[1]	76	131
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[1]	(10)	(28)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[1]	20	5
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[1]	(6)	(2)
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[1]	45	147
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[1]	(5)	(26)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[1]	4	5
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[1]	$ (1)	$ (3)

[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. Unrealized gains and losses on these securities are recorded in Net Income.

[2] Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Power’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 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, 2019.

[3] Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). 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, 2019.

[4] Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. These investments are guaranteed by the U.S. government or an agency of the U.S. government. Power also has investments in municipal bonds that are primarily in investment grade securities. It is not expected that these securities will 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, 2019.

[5] Debt Securities (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG’s Rabbi Trust investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. These investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG also has investments in municipal bonds that are primarily in investment grade securities. It is not expected that these securities will 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, 2019.