Revenues Revenues (Details) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019 USD ($) $ / mwd MW	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / mwd MW	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenues [Abstract]
Loss on Lease Investments included in Revenues											$ 8
Loss on Lease Investments included in Revenues											20	$ 77
Provision for Loan and Lease Losses										$ 58		7
Revenue from Contract with Customer, Including Assessed Tax										9,308	9,337	8,347
Revenues Unrelated to Contracts with Customers	[1]									768	359	747
Operating Revenues		$ 2,478	$ 2,302	$ 2,316	$ 2,980	$ 2,468	$ 2,394	$ 2,016	$ 2,818	10,076	9,696	9,094
Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax										6,559	6,398	6,259
Revenues Unrelated to Contracts with Customers										66	73	65	[1]
Operating Revenues										$ 6,625	$ 6,471	6,324
Allowances percentage of accounts receivable		6.00%				7.00%				6.00%	7.00%
PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax										$ 3,666	$ 3,899	3,133
Revenues Unrelated to Contracts with Customers										719	247	727	[1]
Operating Revenues										4,385	4,146	3,860
Revenue, remaining performance obligation, amount		$ 168								168
Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										566	532	511
Revenues Unrelated to Contracts with Customers										(17)	39	(45)	[1]
Operating Revenues										549	571	466
Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										(1,483)	(1,492)	(1,556)
Revenues Unrelated to Contracts with Customers										0	0	0	[1]
Operating Revenues										(1,483)	(1,492)	(1,556)
LIPA OSA contract fixed component [Member] | Other [Member]
Revenue, remaining performance obligation, amount		$ 67								67
Electric Distribution Contracts [Member]
Revenue from Contract with Customer, Including Assessed Tax										3,224	3,131	3,088
Electric Distribution Contracts [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax										3,224	3,131	3,088
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
Electric Distribution Contracts [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Gas Distribution Contracts [Member]
Revenue from Contract with Customer, Including Assessed Tax										1,855	1,738	1,670
Gas Distribution Contracts [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax										1,870	1,756	1,684
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
Gas Distribution Contracts [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										(15)	(18)	(14)
Transmission [Member]
Revenue from Contract with Customer, Including Assessed Tax										1,181	1,236	1,222
Transmission [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax										1,181	1,236	1,222
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
Transmission [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Other Contract Revenues [Member]
Revenue from Contract with Customer, Including Assessed Tax	[2]									891	847	814
Other Contract Revenues [Member] | Public Service Electric and Gas Company
Revenue from Contract with Customer, Including Assessed Tax										284	275	265	[2]
Other Contract Revenues [Member] | PSEG Power LLC
Revenue from Contract with Customer, Including Assessed Tax										46	44	42	[2]
Other Contract Revenues [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										566	532	511	[2]
Other Contract Revenues [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										(5)	(4)	(4)	[2]
ISO New England [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax										137	92	39
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										137	92	39
ISO New England [Member] | Electricity and Related Products [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
ISO New England [Member] | Electricity and Related Products [Member] | Eliminations [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										143	209	181
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										143	209	181
NY ISO [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] | Eliminations [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										92	151	134
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										92	151	134
Third Party Sales [Member] | Natural Gas [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Third Party Sales [Member] | Natural Gas [Member] | Eliminations [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										1,785	1,933	1,199
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										1,785	1,933	1,199
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [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] | Eliminations [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] | 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										927	861	804
Sales to Affiliates [Member] | Natural Gas [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Sales to Affiliates [Member] | Natural Gas [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										(927)	(861)	(804)
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] | 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										536	609	734
Sales to Affiliates [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] | PJM [Member] | Electricity and Related Products [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										$ (536)	$ (609)	$ (734)
June 2019 to May 2020 [Member] | PJM [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		116								116
Load (MW) | MW		8,300								8,300
June 2019 to May 2020 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		1,330								1,330
June 2020 to May 2021 [Member] | PJM [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		179								179
Load (MW) | MW		7,300								7,300
June 2020 to May 2021 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		195								195
Load (MW) | MW		1,330								1,330
June 2021 to May 2022 [Member] | PJM [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		182								182
Load (MW) | MW		6,900								6,900
June 2021 to May 2022 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		192								192
Load (MW) | MW		950								950
June 2022 to May 2023 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		179								179
Load (MW) | MW		950								950
June 2023 to May 2024 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480
June 2024 to May 2025 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480
June 2025 to May 2026 [Member] | ISO New England [Member] | PSEG Power LLC
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480

[1] Includes primarily alternative revenues at PSE&G, derivative contracts at PSEG Power, and lease contracts in Other. For the years ended December 31, 2019, 2018 and 2017, Other includes losses of $58 million, $8 million and $77 million, respectively, related to Energy Holdings’ investments in leases. For additional information, see Note 9. Long-Term Investments.

[2] 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.