Revenues Revenues (Details) $ in Millions		12 Months Ended
		Dec. 31, 2020 USD ($) $ / mwd MW	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)		Jan. 01, 2020 USD ($)
Lease losses included in Revenues		$ 26	$ 58	$ 8
Revenue from Contract with Customer, Including Assessed Tax		9,099	9,308	9,337
Revenues Unrelated to Contracts with Customers	[1]	504	768	359
Operating Revenues		9,603	10,076	9,696
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(1,234)	(1,483)	(1,492)
Revenues Unrelated to Contracts with Customers		0	0	0	[1]
Operating Revenues	[2]	(1,234)	(1,483)	(1,492)
Public Service Electric and Gas Company
Operating Revenues		6,608	6,625	6,471
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		206
Provision for Other Credit Losses		175	87
Accounts Receivable, Allowance for Credit Loss, Writeoff		(37)	(90)
Accounts Receivable, Allowance for Credit Loss, Recovery		5	8
Accounts Receivable, Allowance for Credit Loss		60		63
Public Service Electric and Gas Company | Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses						$ 8
Public Service Electric and Gas Company | Cumulative Effect, Period of Adoption, Adjusted Balance
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses	[3]					$ 68
Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		6,599	6,559	6,398
Revenues Unrelated to Contracts with Customers		9	66	73	[1]
Operating Revenues		$ 6,608	$ 6,625	6,471
Allowances percentage of accounts receivable		14.00%	6.00%
PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		$ 3,147	$ 3,666	3,899
Revenues Unrelated to Contracts with Customers		487	719	247	[1]
Operating Revenues		3,634	4,385	4,146
Revenue, remaining performance obligation, amount		146
Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		587	566	532
Revenues Unrelated to Contracts with Customers		8	(17)	39	[1]
Operating Revenues		595	549	571
LIPA OSA contract fixed component [Member] | Other [Member]
Revenue, remaining performance obligation, amount		68
Electric Distribution Contracts [Member]
Revenue from Contract with Customer, Including Assessed Tax		3,130	3,224	3,131
Electric Distribution Contracts [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Electric Distribution Contracts [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		3,130	3,224	3,131
Electric Distribution Contracts [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Electric Distribution Contracts [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Gas Distribution Contracts [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,634	1,855	1,738
Gas Distribution Contracts [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(12)	(15)	(18)
Gas Distribution Contracts [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		1,646	1,870	1,756
Gas Distribution Contracts [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Gas Distribution Contracts [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Transmission [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,485	1,181	1,236
Transmission [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Transmission [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		1,485	1,181	1,236
Transmission [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Transmission [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Other Contract Revenues [Member]
Revenue from Contract with Customer, Including Assessed Tax	[4]	966	891	847
Other Contract Revenues [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(4)	(5)	(4)	[4]
Other Contract Revenues [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		338	284	275	[4]
Other Contract Revenues [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		45	46	44	[4]
Other Contract Revenues [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		587	566	532	[4]
ISO New England [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax		126	137	92
ISO New England [Member] | Electricity and Related Products [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
ISO New England [Member] | Electricity and Related Products [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
ISO New England [Member] | Electricity and Related Products [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		126	137	92
ISO New England [Member] | Electricity and Related Products [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
NY ISO [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax		124	143	209
NY ISO [Member] | Electricity and Related Products [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
NY ISO [Member] | Electricity and Related Products [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
NY ISO [Member] | Electricity and Related Products [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		124	143	209
NY ISO [Member] | Electricity and Related Products [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Third Party Sales [Member] | Natural Gas [Member]
Revenue from Contract with Customer, Including Assessed Tax		83	92	151
Third Party Sales [Member] | Natural Gas [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Third Party Sales [Member] | Natural Gas [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Third Party Sales [Member] | Natural Gas [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		83	92	151
Third Party Sales [Member] | Natural Gas [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,551	1,785	1,933
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		1,551	1,785	1,933
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Sales to Affiliates [Member] | Natural Gas [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Sales to Affiliates [Member] | Natural Gas [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(771)	(927)	(861)
Sales to Affiliates [Member] | Natural Gas [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Sales to Affiliates [Member] | Natural Gas [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		771	927	861
Sales to Affiliates [Member] | Natural Gas [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Sales to Affiliates [Member] | PJM [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Sales to Affiliates [Member] | PJM [Member] | Electricity and Related Products [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(447)	(536)	(609)
Sales to Affiliates [Member] | PJM [Member] | Electricity and Related Products [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax		0	0	0
Sales to Affiliates [Member] | PJM [Member] | Electricity and Related Products [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax		447	536	609
Sales to Affiliates [Member] | PJM [Member] | Electricity and Related Products [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 0	$ 0	$ 0
June 2019 to May 2020 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231
June 2020 to May 2021 [Member] | PJM [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		167
Load (MW) | MW		7,600
June 2020 to May 2021 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		195
Load (MW) | MW		1,330
June 2021 to May 2022 [Member] | PJM [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		180
Load (MW) | MW		7,000
June 2021 to May 2022 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		192
Load (MW) | MW		950
June 2022 to May 2023 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		179
Load (MW) | MW		950
June 2023 to May 2024 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		152
Load (MW) | MW		930
June 2024 to May 2025 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231
Load (MW) | MW		480
June 2025 to May 2026 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231
Load (MW) | MW		480

[1] Includes primarily alternative revenues at PSE&G, derivative contracts and lease contracts at PSEG Power, and lease contracts in Other. For the years ended December 31, 2020, 2019 and 2018, Other includes losses of $26 million, $58 million and $8 million, respectively, related to Energy Holdings’ investments in leases. For additional information, see Note 9. Long-Term Investments.

[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 26. Related-Party Transactions.

[3] Includes an $8 million pre-tax increase upon adoption of ASU 2016-13.

[4] Includes primarily revenues from appliance repair services 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.