Revenues Revenues (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021 USD ($) $ / mwd MW	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / mwd MW		Jun. 30, 2020 USD ($)		Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)
Revenues [Line Items]
Revenue from Contract with Customers		$ 2,164	$ 2,025	$ 5,018		$ 4,474
Revenues Unrelated to Contracts with Customers		(290)	25	(255)	[1]	357	[1]
Total Operating Revenues		1,874	2,050	4,763		4,831
Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(175)	(237)	(677)		(715)
Revenues Unrelated to Contracts with Customers		0	0	0	[1]	0	[1]
Total Operating Revenues	[2]	(175)	(237)	(677)		(715)
Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		765	723	1,472		1,372
Electric Distribution Contracts [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		254	276	1,147		1,005
Gas Distribution [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(2)	(2)	(5)		(4)
Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		405	378	804		744
Electric Transmission [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		408	346	879		714
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(62)	(111)	(150)		(232)
Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		49	24	97		49
Electricity and Related Products [Member] | NY ISO [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		18	25	69		73
Electricity and Related Products [Member] | ISO New England [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		28	15	88		44
Gas Sales [Member] | Third Party Sales [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Gas Sales [Member] | Sales to Affiliates [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(110)	(124)	(520)		(478)
Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers		237	238	462	[3]	473	[3]
Other Revenues from Contracts with Customers [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(1)	0	(2)	[3]	(1)	[3]
Public Service Electric and Gas Company [Member]
Revenues [Line Items]
Revenue from Contract with Customers		1,507	1,462	3,584		3,290
Revenues Unrelated to Contracts with Customers		7	(6)	3	[1]	49	[1]
Total Operating Revenues		$ 1,514	1,456	$ 3,587		3,339
Allowances percentage of accounts receivable		18.00%		18.00%				14.00%
Public Service Electric and Gas Company [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		$ 765	723	$ 1,472		1,372
Public Service Electric and Gas Company [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		256	278	1,152		1,009
Public Service Electric and Gas Company [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		405	378	804		744
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Public Service Electric and Gas Company [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Public Service Electric and Gas Company [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Public Service Electric and Gas Company [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Public Service Electric and Gas Company [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers		81	83	156	[3]	165	[3]
PSEG Power [Member]
Revenues [Line Items]
Revenue from Contract with Customers		687	659	1,825		1,614
Revenues Unrelated to Contracts with Customers		(307)	24	(278)	[1]	289	[1]
Total Operating Revenues		380	683	1,547		1,903
Anticipated Contract Revenues		$ 138		$ 138
PSEG Power [Member] | PJM [Member] | June 2021 to May 2022 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		166		166
Load (MW) | MW		7,700		7,700
PSEG Power [Member] | PJM [Member] | June 2022 to May 2023 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		98		98
Load (MW) | MW		6,300		6,300
PSEG Power [Member] | ISO New England [Member] | June 2021 to May 2022 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		192		192
Load (MW) | MW		950		950
PSEG Power [Member] | ISO New England [Member] | June 2022 to May 2023 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		179		179
Load (MW) | MW		950		950
PSEG Power [Member] | ISO New England [Member] | June 2023 to May 2024 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		152		152
Load (MW) | MW		930		930
PSEG Power [Member] | ISO New England [Member] | June 2024 to May 2025 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		158		158
Load (MW) | MW		950		950
PSEG Power [Member] | ISO New England [Member] | June 2025 to May 2026 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		231		231
Load (MW) | MW		480		480
PSEG Power [Member] | ISO New England [Member] | Seven year rate BH5 lock through 2026
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		231		231
PSEG Power [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		$ 0	0	$ 0		0
PSEG Power [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
PSEG Power [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		408	346	879		714
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		62	111	150		232
PSEG Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		49	24	97		49
PSEG Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		18	25	69		73
PSEG Power [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		28	15	88		44
PSEG Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		110	124	520		478
PSEG Power [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers		12	14	22	[3]	24	[3]
Other [Member]
Revenues [Line Items]
Revenue from Contract with Customers		145	141	286		285
Revenues Unrelated to Contracts with Customers		10	7	20	[1]	19	[1]
Total Operating Revenues		155	148	306		304
Other [Member] | LIPA OSA contract fixed component [Member]
Revenues [Line Items]
Anticipated Contract Revenues		68		68
Other [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0		0
Other [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers		145	141	286	[3]	285	[3]
Public Service Electric and Gas Company [Member]
Revenues [Line Items]
Total Operating Revenues		1,514	1,456	3,587		3,339
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		239	80	206		68
Provision for Other Credit Losses		34	45	78		77
Accounts Receivable, Allowance for Credit Loss, Writeoff		(13)	(4)	(24)		(24)
Accounts Receivable, Allowance for Credit Loss, Recovery		5	1	7		3
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		260	121	260		121
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		260	121	260		121		$ 206
Public Service Electric and Gas Company [Member] | Cumulative Effect, Period of Adoption, Adjustment
Revenues [Line Items]
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses									$ 8
PSEG Power [Member]
Revenues [Line Items]
Total Operating Revenues		$ 380	$ 683	$ 1,547		$ 1,903

[1] Includes primarily alternative revenues at PSE&G, derivative contracts and lease contracts at PSEG Power, and lease contracts in Other.

[2] Intercompany eliminations primarily relate to intercompany transactions between PSE&G and PSEG Power. For a further discussion of the intercompany transactions between PSE&G and PSEG Power, see Note 20. Related-Party Transactions.

[3] Includes primarily revenues from appliance repair services and the sale of solar renewable energy certificates (SRECs) at auction at PSE&G, solar power projects and energy management and fuel service contracts with LIPA at PSEG Power, and PSEG LI’s OSA with LIPA in Other.