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, 2018	Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months			$ 603
Gross Unrealized Losses, Less than 12 Months			(8)
Fair Value, Greater Than 12 Months			120
Gross Unrealized Losses, Greater Than 12 Months			(3)
Fair Value, Less Than 12 Months		$ 479
Gross Unrealized Losses, Less than 12 Months		(59)
Fair Value, Greater Than 12 Months		549
Gross Unrealized Losses, Greater Than 12 Months		(24)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[1]	147	40
Gross Unrealized Losses, Less than 12 Months	[1]	(26)	(2)
Fair Value, Greater Than 12 Months	[1]	5	0
Gross Unrealized Losses, Greater Than 12 Months	[1]	(3)	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[1]	131	29
Gross Unrealized Losses, Less than 12 Months	[1]	(28)	(3)
Fair Value, Greater Than 12 Months	[1]	5	2
Gross Unrealized Losses, Greater Than 12 Months	[1]	(2)	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[1]	278	69
Gross Unrealized Losses, Less than 12 Months	[1]	(54)	(5)
Fair Value, Greater Than 12 Months	[1]	10	2
Gross Unrealized Losses, Greater Than 12 Months	[1]	(5)	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government Obligations [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[2]		343
Gross Unrealized Losses, Less than 12 Months	[2]		(2)
Fair Value, Greater Than 12 Months	[2]		91
Gross Unrealized Losses, Greater Than 12 Months	[2]		(2)
Fair Value, Less Than 12 Months	[2]	51
Gross Unrealized Losses, Less than 12 Months	[2]	0
Fair Value, Greater Than 12 Months	[2]	317
Gross Unrealized Losses, Greater Than 12 Months	[2]	(9)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Corporate Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[3]		191
Gross Unrealized Losses, Less than 12 Months	[3]		(1)
Fair Value, Greater Than 12 Months	[3]		27
Gross Unrealized Losses, Greater Than 12 Months	[3]		(1)
Fair Value, Less Than 12 Months	[3]	150
Gross Unrealized Losses, Less than 12 Months	[3]	(5)
Fair Value, Greater Than 12 Months	[3]	222
Gross Unrealized Losses, Greater Than 12 Months	[3]	(10)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months			534
Gross Unrealized Losses, Less than 12 Months			(3)
Fair Value, Greater Than 12 Months			118
Gross Unrealized Losses, Greater Than 12 Months			(3)
Fair Value, Less Than 12 Months		201
Gross Unrealized Losses, Less than 12 Months		(5)
Fair Value, Greater Than 12 Months		539
Gross Unrealized Losses, Greater Than 12 Months		(19)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months			67
Gross Unrealized Losses, Less than 12 Months			(1)
Fair Value, Greater Than 12 Months			34
Gross Unrealized Losses, Greater Than 12 Months			(1)
Fair Value, Less Than 12 Months		68
Gross Unrealized Losses, Less than 12 Months		(3)
Fair Value, Greater Than 12 Months		88
Gross Unrealized Losses, Greater Than 12 Months		(3)
Rabbi Trust [Member] | Government Obligations [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[4]		28
Gross Unrealized Losses, Less than 12 Months	[4]		0
Fair Value, Greater Than 12 Months	[4]		25
Gross Unrealized Losses, Greater Than 12 Months	[4]		(1)
Fair Value, Less Than 12 Months	[2]	18
Gross Unrealized Losses, Less than 12 Months	[2]	0
Fair Value, Greater Than 12 Months	[2]	59
Gross Unrealized Losses, Greater Than 12 Months	[2]	(2)
Rabbi Trust [Member] | Corporate Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months	[5]		39
Gross Unrealized Losses, Less than 12 Months	[5]		(1)
Fair Value, Greater Than 12 Months	[5]		9
Gross Unrealized Losses, Greater Than 12 Months	[5]		0
Fair Value, Less Than 12 Months	[3]	50
Gross Unrealized Losses, Less than 12 Months	[3]	(3)
Fair Value, Greater Than 12 Months	[3]	29
Gross Unrealized Losses, Greater Than 12 Months	[3]	(1)
Rabbi Trust [Member] | Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Fair Value, Less Than 12 Months			67
Gross Unrealized Losses, Less than 12 Months			(1)
Fair Value, Greater Than 12 Months			34
Gross Unrealized Losses, Greater Than 12 Months			$ (1)
Fair Value, Less Than 12 Months		68
Gross Unrealized Losses, Less than 12 Months		(3)
Fair Value, Greater Than 12 Months		88
Gross Unrealized Losses, Greater Than 12 Months		$ (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. Effective January 1, 2018, 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 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.

[3] 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.

[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. 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.

[5] 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.