Revenues Revenues (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021 USD ($) $ / mwd MW	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / mwd MW		Sep. 30, 2020 USD ($)		Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)
Revenues [Line Items]
Revenue from Contract with Customers		$ 2,759	$ 2,415	$ 7,777		$ 6,889
Revenues Unrelated to Contracts with Customers		(856)	(45)	(1,111)	[1]	312	[1]
Total Operating Revenues		1,903	2,370	6,666		7,201
Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(127)	(179)	(804)		(894)
Revenues Unrelated to Contracts with Customers		0	0	0	[1]	0	[1]
Total Operating Revenues	[2]	(127)	(179)	(804)		(894)
Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		1,181	1,157	2,653		2,529
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		138	112	1,285		1,117
Gas Distribution [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(4)	(4)	(9)		(8)
Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		409	370	1,213		1,114
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		622	464	1,501		1,178
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		(65)	(123)	(215)		(355)
Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		69	36	166		85
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		49	13	118		86
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		47	14	135		58
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		(58)	(50)	(578)		(528)
Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers		244	249	706	[3]	722	[3]
Other Revenues from Contracts with Customers [Member] | Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	(2)	(2)	[3]	(3)	[3]
Public Service Electric and Gas Company [Member]
Revenues [Line Items]
Revenue from Contract with Customers		1,812	1,719	5,396		5,009
Revenues Unrelated to Contracts with Customers		8	(59)	11	[1]	(10)	[1]
Total Operating Revenues		$ 1,820	1,660	$ 5,407		4,999
Allowances percentage of accounts receivable		19.00%		19.00%				14.00%
Public Service Electric and Gas Company [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		$ 1,181	1,157	$ 2,653		2,529
Public Service Electric and Gas Company [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		142	116	1,294		1,125
Public Service Electric and Gas Company [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		409	370	1,213		1,114
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		80	76	236	[3]	241	[3]
PSEG Power [Member]
Revenues [Line Items]
Revenue from Contract with Customers		915	713	2,740		2,327
Revenues Unrelated to Contracts with Customers		(864)	33	(1,142)	[1]	322	[1]
Total Operating Revenues		51	746	1,598		2,649
Anticipated Contract Revenues		123		123
PSEG Power [Member] | Expected to be transferred upon sale of Fossil
Revenues [Line Items]
Anticipated Contract Revenues		$ 44		$ 44
PSEG Power [Member] | PJM [Member] | June 2021 to May 2022 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		166		166
Load (MW) | MW	[4]	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	[4]	6,300		6,300
PSEG Power [Member] | PJM [Member] | Expected to be transferred upon sale of Fossil
Revenues [Line Items]
Load (MW) | MW		3,400		3,400
PSEG Power [Member] | ISO New England [Member] | June 2021 to May 2022 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	[5]	192		192
Load (MW) | MW	[6]	950		950
PSEG Power [Member] | ISO New England [Member] | June 2022 to May 2023 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	[5]	179		179
Load (MW) | MW	[6]	950		950
PSEG Power [Member] | ISO New England [Member] | June 2023 to May 2024 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	[5]	152		152
Load (MW) | MW	[6]	930		930
PSEG Power [Member] | ISO New England [Member] | June 2024 to May 2025 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	[5]	158		158
Load (MW) | MW	[6]	950		950
PSEG Power [Member] | ISO New England [Member] | June 2025 to May 2026 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	[5]	231		231
Load (MW) | MW	[6]	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		622	464	1,501		1,178
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		65	123	215		355
PSEG Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		69	36	166		85
PSEG Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		49	13	118		86
PSEG Power [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		47	14	135		58
PSEG Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		58	50	578		528
PSEG Power [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers		5	13	27	[3]	37	[3]
Other [Member]
Revenues [Line Items]
Revenue from Contract with Customers		159	162	445		447
Revenues Unrelated to Contracts with Customers		0	(19)	20	[1]	0	[1]
Total Operating Revenues		159	143	465		447
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		159	162	445	[3]	447	[3]
Public Service Electric and Gas Company [Member]
Revenues [Line Items]
Total Operating Revenues		1,820	1,660	5,407		4,999
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		260	121	206		68
Provision for Other Credit Losses		46	43	124		120
Accounts Receivable, Allowance for Credit Loss, Writeoff		(19)	(6)	(43)		(30)
Accounts Receivable, Allowance for Credit Loss, Recovery		4	1	11		4
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		287	158	287		158
Accounts Receivable and Unbilled Revenues, Allowance for Credit Losses		287	158	287		158		$ 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		$ 51	$ 746	$ 1,598		$ 2,649

[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.

[4] Of the existing MWs cleared, an approximate average of 3,400 MWs are expected to be transferred with the sale of PSEG Power’s fossil generation portfolio.

[5] Capacity cleared prices for BH5 through 2026 will be escalated based upon the Handy-Whitman Index. These adjustments are not included above.

[6] Of the existing MWs cleared, the majority of these MWs are expected to be transferred with the sale of PSEG Power’s fossil generation portfolio.