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		Dec. 31, 2020	Dec. 31, 2019
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months		$ 152	$ 197
Gross Unrealized Losses, Less than 12 Months		(6)	(5)
Fair Value, Greater Than 12 Months		40	82
Gross Unrealized Losses, Greater Than 12 Months		(8)	(13)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC | Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[1]	23	21
Gross Unrealized Losses, Less than 12 Months	[1]	(2)	(1)
Fair Value, Greater Than 12 Months	[1]	6	6
Gross Unrealized Losses, Greater Than 12 Months	[1]	(1)	(3)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC | International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[1]	26	28
Gross Unrealized Losses, Less than 12 Months	[1]	(2)	(2)
Fair Value, Greater Than 12 Months	[1]	27	34
Gross Unrealized Losses, Greater Than 12 Months	[1]	(7)	(9)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC | Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[1]	49	49
Gross Unrealized Losses, Less than 12 Months	[1]	(4)	(3)
Fair Value, Greater Than 12 Months	[1]	33	40
Gross Unrealized Losses, Greater Than 12 Months	[1]	(8)	(12)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC | Government Obligations [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[2]	72	99
Gross Unrealized Losses, Less than 12 Months	[2]	(1)	(2)
Fair Value, Greater Than 12 Months	[2]	0	30
Gross Unrealized Losses, Greater Than 12 Months	[2]	0	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC | Corporate Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[3]	31	49
Gross Unrealized Losses, Less than 12 Months	[3]	(1)	0
Fair Value, Greater Than 12 Months	[3]	7	12
Gross Unrealized Losses, Greater Than 12 Months	[3]	0	(1)
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power LLC | Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months		103	148
Gross Unrealized Losses, Less than 12 Months		(2)	(2)
Fair Value, Greater Than 12 Months		7	42
Gross Unrealized Losses, Greater Than 12 Months		0	(1)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months		21	37
Gross Unrealized Losses, Less than 12 Months		0	0
Fair Value, Greater Than 12 Months		1	5
Gross Unrealized Losses, Greater Than 12 Months		0	0
Rabbi Trust [Member] | Government Obligations [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[4]	19	26
Gross Unrealized Losses, Less than 12 Months	[4]	0	0
Fair Value, Greater Than 12 Months	[4]	0	3
Gross Unrealized Losses, Greater Than 12 Months	[4]	0	0
Rabbi Trust [Member] | Corporate Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[5]	2	11
Gross Unrealized Losses, Less than 12 Months	[5]	0	0
Fair Value, Greater Than 12 Months	[5]	1	2
Gross Unrealized Losses, Greater Than 12 Months	[5]	0	0
Rabbi Trust [Member] | Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months		21	37
Gross Unrealized Losses, Less than 12 Months		0	0
Fair Value, Greater Than 12 Months		1	5
Gross Unrealized Losses, Greater Than 12 Months		$ 0	$ 0

[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 (Government)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). The unrealized losses on PSEG Power’s NDT investments in U.S. Treasury obligations and Federal Agency mortgage-backed securities were caused by interest rate changes. PSEG Power also has investments in municipal bonds. It is not expected that these securities will settle for less than their amortized cost. PSEG Power does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG Power did not recognize credit losses for U.S. Treasury obligations and Federal Agency mortgage-backed securities because these investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG Power did not recognize credit losses for municipal bonds because they are primarily investment grade securities.

[3] Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Unrealized losses were due to market declines. It is not expected that these securities would settle for less than their amortized cost. PSEG Power does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG Power did not recognize credit losses for these corporate bonds because they are primarily investment grade securities.

[4] 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. PSEG also has investments in municipal bonds. It is not expected that these securities will settle for less than their amortized cost. PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG did not recognize credit losses for U.S. Treasury obligations and Federal Agency mortgage-backed securities because these investments are guaranteed by the U.S. government or an agency of the U.S. government. PSEG did not recognize credit losses for municipal bonds because they are primarily investment grade securities.

[5] Debt Securities (Corporate)—Unrealized gains and losses on these securities are recorded in Accumulated Other Comprehensive Income (Loss). Unrealized losses were due to market declines. It is not expected that these securities would settle for less than their amortized cost. PSEG does not intend to sell these securities nor will it be more-likely-than-not required to sell before recovery of their amortized cost. PSEG did not recognize credit losses for these corporate bonds because they are primarily investment grade.