Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Fair Value		$ 978
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			$ 67
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			34
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			1
Cost		228
Gross Unrealized Gains		2
Gross Unrealized Losses		(6)
Fair Value		201
Cost			227
Gross Unrealized Gains			6
Gross Unrealized Losses			(2)
Fair Value		224	231
Rabbi Trust [Member] | Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost		22
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Fair Value		23
Cost			24
Gross Unrealized Gains			3
Gross Unrealized Losses			0
Fair Value			27
Rabbi Trust [Member] | International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost		0
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		0
Cost			0
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Fair Value			0
Rabbi Trust [Member] | Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost		22
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Fair Value		23
Cost			24
Gross Unrealized Gains			3
Gross Unrealized Losses			0
Fair Value			27
Unrealized Gains (Losses) on Equity Securities still held		(2)
Rabbi Trust [Member] | Government Obligations [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[1]		28
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[1]		0
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[1]		25
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[1]		1
Cost		110
Gross Unrealized Gains		1
Gross Unrealized Losses		(2)
Fair Value		109
Cost			85
Gross Unrealized Gains			1
Gross Unrealized Losses			(1)
Fair Value			85
Rabbi Trust [Member] | Corporate Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[2]		39
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[2]		1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[2]		9
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[2]		0
Cost		96
Gross Unrealized Gains		0
Gross Unrealized Losses		(4)
Fair Value		92
Cost			118
Gross Unrealized Gains			2
Gross Unrealized Losses			(1)
Fair Value			119
Rabbi Trust [Member] | Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent		(4)
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			67
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			34
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			1
Cost		206
Gross Unrealized Gains		1
Gross Unrealized Losses		(6)
Fair Value		201
Cost			203
Gross Unrealized Gains			3
Gross Unrealized Losses			(2)
Fair Value			204
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			603
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			8
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			120
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			3
Cost		1,769
Gross Unrealized Gains		192
Gross Unrealized Losses		(83)
Fair Value		1,878
Cost			1,794
Gross Unrealized Gains			350
Gross Unrealized Losses			(11)
Fair Value			2,133
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[3]	147	40
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[3]	26	2
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[3]	5	0
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[3]	3	0
Cost		447
Gross Unrealized Gains		153
Gross Unrealized Losses		(29)
Fair Value		571
Cost			497
Gross Unrealized Gains			245
Gross Unrealized Losses			(2)
Fair Value			740
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[3]	131	29
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[3]	28	3
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[3]	5	2
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[3]	2	0
Cost		323
Gross Unrealized Gains		36
Gross Unrealized Losses		(30)
Fair Value		329
Cost			311
Gross Unrealized Gains			99
Gross Unrealized Losses			(3)
Fair Value			407
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[3]	278	69
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[3]	54	5
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[3]	10	2
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[3]	5	0
Cost		770
Gross Unrealized Gains		189
Gross Unrealized Losses		(59)
Fair Value		900
Cost			808
Gross Unrealized Gains			344
Gross Unrealized Losses			(5)
Fair Value			1,147
Unrealized Gains (Losses) on Equity Securities still held		(127)
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Government Obligations [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[4]		343
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[4]		2
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[4]		91
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[4]		2
Cost		498
Gross Unrealized Gains		2
Gross Unrealized Losses		(9)
Fair Value		491
Cost			586
Gross Unrealized Gains			2
Gross Unrealized Losses			(4)
Fair Value			584
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Corporate Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	[5]		191
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	[5]		1
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	[5]		27
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[5]		1
Cost		501
Gross Unrealized Gains		1
Gross Unrealized Losses		(15)
Fair Value		487
Cost			400
Gross Unrealized Gains			4
Gross Unrealized Losses			(2)
Fair Value			402
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent		(12)
Trust Investments, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value			534
Trust Investments, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			3
Trust Investments, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value			118
Trust Investments, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			3
Cost		999
Gross Unrealized Gains		3
Gross Unrealized Losses		(24)
Fair Value		978
Cost			986
Gross Unrealized Gains			6
Gross Unrealized Losses			(6)
Fair Value			986
Power [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Fair Value		$ 56	$ 57

[1] 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 December 31, 2018.

[2] 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 December 31, 2018.

[3] Equity Securities—Investments in marketable equity securities within the NDT Fund are primarily in common stocks within a broad range of industries and sectors. Effective January 1, 2018, unrealized gains and losses on these securities are recorded in Net Income.

[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 December 31, 2018.

[5] 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 December 31, 2018.