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		Jun. 30, 2018	Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value		$ 913	$ 603
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses		(42)	(8)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value		93	120
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		(6)	(3)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[1]	79	40
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[1]	(8)	(2)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[1]	0	0
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[1]	0	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[1]	74	29
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[1]	(13)	(3)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[1]	4	2
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[1]	(1)	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[1]	153	69
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[1]	(21)	(5)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[1]	4	2
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[1]	(1)	0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Government [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[2]	402	343
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[2]	(9)	(2)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[2]	64	91
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[2]	(3)	(2)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Corporate [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[3]	358	191
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[3]	(12)	(1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[3]	25	27
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[3]	(2)	(1)
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] | Total Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value		760	534
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses		(21)	(3)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value		89	118
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		(5)	(3)
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value		150	67
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses		(5)	(1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value		29	34
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		(1)	(1)
Rabbi Trust [Member] | Government [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[4]	57	28
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[4]	(1)	0
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[4]	23	25
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[4]	(1)	(1)
Rabbi Trust [Member] | Corporate [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value	[5]	93	39
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses	[5]	(4)	(1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value	[5]	6	9
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses	[5]	0	0
Rabbi Trust [Member] | Total Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Continuous Unrealized Loss Position, Less Than 12 Months, Fair Value		150	67
Continuous Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Losses		(5)	(1)
Continuous Unrealized Loss Position, Greater Than 12 Months, Fair Value		29	34
Continuous Unrealized Loss Position, Greater Than 12 Months, Gross Unrealized Losses		$ (1)	$ (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. 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 June 30, 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 June 30, 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 June 30, 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 June 30, 2018.