Revenues Revenues (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019 USD ($) $ / mwd MW	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / mwd MW	Sep. 30, 2018 USD ($)	Dec. 31, 2018
Revenues [Line Items]
Residual Value impairment				$ 58
Revenue from Contract with Customers		$ 2,308	$ 2,383	7,086	$ 6,989
Revenues Unrelated to Contracts with Customers	[1]	(6)	11	512	239
Total Operating Revenues		2,302	2,394	7,598	7,228
Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		1,096	1,072	2,613	2,516
Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		125	136	1,261	1,136
Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		295	312	887	925
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		488	558	1,426	1,429
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] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		38	56	108	161
Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		37	12	85	73
Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		12	24	70	118
Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers	[2]	$ 217	213	$ 636	631
Public Service Electric and Gas Company [Member]
Revenues [Line Items]
Allowances percentage of accounts receivable		7.00%		7.00%		7.00%
Revenue from Contract with Customers		$ 1,585	1,586	$ 4,968	4,785
Revenues Unrelated to Contracts with Customers	[1]	19	9	50	41
Total Operating Revenues		1,604	1,595	5,018	4,826
Public Service Electric and Gas Company [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		1,096	1,072	2,613	2,516
Public Service Electric and Gas Company [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		130	142	1,272	1,149
Public Service Electric and Gas Company [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		295	312	887	925
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	[2]	64	60	196	195
PSEG Power [Member]
Revenues [Line Items]
Revenue from Contract with Customers		806	875	2,781	2,857
Revenues Unrelated to Contracts with Customers	[1]	(35)	(7)	489	181
Total Operating Revenues		771	868	3,270	3,038
Anticipated Contract Revenues		$ 168		$ 168
PSEG Power [Member] | PJM [Member] | June 2019 to May 2020 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		116		116
Load (MW) | MW		8,300		8,300
PSEG Power [Member] | PJM [Member] | June 2020 to May 2021 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		179		179
Load (MW) | MW		7,300		7,300
PSEG Power [Member] | PJM [Member] | June 2021 to May 2022 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		182		182
Load (MW) | MW		6,900		6,900
PSEG Power [Member] | ISO New England [Member] | June 2019 to May 2020 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		231		231
Load (MW) | MW		1,330		1,330
PSEG Power [Member] | ISO New England [Member] | June 2020 to May 2021 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		195		195
Load (MW) | MW		1,330		1,330
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		231		231
Load (MW) | MW		480		480
PSEG Power [Member] | ISO New England [Member] | June 2024 to May 2025 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd		231		231
Load (MW) | MW		480		480
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] | 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		488	558	1,426	1,429
PSEG Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		160	166	416	489
PSEG Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		38	56	108	161
PSEG Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		37	12	85	73
PSEG Power [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		12	24	70	118
PSEG Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		58	47	639	552
PSEG Power [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers	[2]	13	12	37	35
Other [Member]
Revenues [Line Items]
Revenue from Contract with Customers		141	142	406	404
Revenues Unrelated to Contracts with Customers	[1]	10	9	(27)	17
Total Operating Revenues		151	151	379	421
Other [Member] | LIPA OSA contract fixed component [Member]
Revenues [Line Items]
Anticipated Contract Revenues		65		65
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	[2]	141	142	406	404
Other [Member] | LIPA OSA contract incentive component [Member]
Revenues [Line Items]
Anticipated Contract Revenues		10		10
Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(224)	(220)	(1,069)	(1,057)
Revenues Unrelated to Contracts with Customers	[1]	0	0	0	0
Total Operating Revenues		(224)	(220)	(1,069)	(1,057)
Eliminations [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Eliminations [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(5)	(6)	(11)	(13)
Eliminations [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Eliminations [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Eliminations [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(160)	(166)	(416)	(489)
Eliminations [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Eliminations [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Eliminations [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers		0	0	0	0
Eliminations [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		(58)	(47)	(639)	(552)
Eliminations [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers	[2]	$ (1)	$ (1)	$ (3)	$ (3)

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

[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.