Revenues Revenues (Details) $ in Millions		3 Months Ended							6 Months Ended	12 Months Ended
		Dec. 31, 2018 USD ($) $ / mwd MW	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / mwd MW	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revenues [Abstract]
Loss on Lease Investments included in Revenues										$ 8
Loss on Lease Investments included in Revenues										20	$ 77	$ 147
Revenue from Contract with Customer, Including Assessed Tax										9,337	8,347	8,174
Revenues Unrelated to Contracts with Customers	[1]									359	747	792
Operating Revenues		$ 2,468	$ 2,394	$ 2,818	$ 2,107	$ 2,254	$ 2,142	$ 2,591	$ 2,016	9,696	9,094	8,966
PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										6,398	6,259	6,285
Revenues Unrelated to Contracts with Customers	[1]									73	65	18
Operating Revenues										6,471	6,324	6,303
Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										3,899	3,133	2,975
Revenues Unrelated to Contracts with Customers	[1]									247	727	886
Operating Revenues										4,146	3,860	3,861
Revenue, remaining performance obligation, amount		170								170
Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										532	511	482
Revenues Unrelated to Contracts with Customers	[1]									39	(45)	(112)
Operating Revenues										571	466	370
Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										(1,492)	(1,556)	(1,568)
Revenues Unrelated to Contracts with Customers	[1]									0	0	0
Operating Revenues										(1,492)	(1,556)	(1,568)
LIPA OSA contract fixed component [Member] | Other [Member]
Revenue, remaining performance obligation, amount		64								64
Electric Distribution Contracts [Member]
Revenue from Contract with Customer, Including Assessed Tax										3,131	3,088	3,327
Electric Distribution Contracts [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										3,131	3,088	3,327
Electric Distribution Contracts [Member] | Power [Member]
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										1,738	1,670	1,560
Gas Distribution Contracts [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										1,756	1,684	1,582
Gas Distribution Contracts [Member] | Power [Member]
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										(18)	(14)	(22)
Transmission [Member]
Revenue from Contract with Customer, Including Assessed Tax										1,236	1,222	1,084
Transmission [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										1,236	1,222	1,084
Transmission [Member] | Power [Member]
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]									847	814	805
Other Contract Revenues [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax	[2]									275	265	292
Other Contract Revenues [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax	[2]									44	42	35
Other Contract Revenues [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	[2]									532	511	482
Other Contract Revenues [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	[2]									(4)	(4)	(4)
LIPA OSA contract incentive component [Member] | Other [Member]
Revenue, remaining performance obligation, amount		$ 10								10
ISO New England [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax										92	39	55
ISO New England [Member] | Electricity and Related Products [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
ISO New England [Member] | Electricity and Related Products [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										92	39	55
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										209	181	169
NY ISO [Member] | Electricity and Related Products [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
NY ISO [Member] | Electricity and Related Products [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										209	181	169
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										151	134	114
Third Party Sales [Member] | Natural Gas [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Third Party Sales [Member] | Natural Gas [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										151	134	114
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										1,933	1,199	1,060
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Third Party Sales [Member] | PJM [Member] | Electricity and Related Products [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										1,933	1,199	1,060
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
Affiliated Entity [Member] | Natural Gas [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Affiliated Entity [Member] | Natural Gas [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Affiliated Entity [Member] | Natural Gas [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										861	804	737
Affiliated Entity [Member] | Natural Gas [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Affiliated Entity [Member] | Natural Gas [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										(861)	(804)	(737)
Affiliated Entity [Member] | PJM [Member] | Electricity and Related Products [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Affiliated Entity [Member] | PJM [Member] | Electricity and Related Products [Member] | PSE&G [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Affiliated Entity [Member] | PJM [Member] | Electricity and Related Products [Member] | Power [Member]
Revenue from Contract with Customer, Including Assessed Tax										609	734	805
Affiliated Entity [Member] | PJM [Member] | Electricity and Related Products [Member] | Other [Member]
Revenue from Contract with Customer, Including Assessed Tax										0	0	0
Affiliated Entity [Member] | PJM [Member] | Electricity and Related Products [Member] | Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax										$ (609)	$ (734)	$ (805)
June 2018 to May 2019 [Member] | PJM [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		205								205
Load (MW) | MW		9,200								9,200
June 2018 to May 2019 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		314								314
Load (MW) | MW		820								820
June 2019 to May 2020 [Member] | PJM [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		116								116
Load (MW) | MW		8,900								8,900
June 2019 to May 2020 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		1,330								1,330
June 2020 to May 2021 [Member] | PJM [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		170								170
Load (MW) | MW		8,100								8,100
June 2020 to May 2021 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		195								195
Load (MW) | MW		1,330								1,330
June 2021 to May 2022 [Member] | PJM [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		178								178
Load (MW) | MW		7,700								7,700
June 2021 to May 2022 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		192								192
Load (MW) | MW		950								950
June 2022 to May 2023 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480
June 2023 to May 2024 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480
June 2024 to May 2025 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480
June 2025 to May 2026 [Member] | ISO New England [Member] | Power [Member]
Dollars Per Megawatt-Day | $ / mwd		231								231
Load (MW) | MW		480								480

[1] Includes primarily alternative revenues at PSE&G, derivative contracts at Power, and lease contracts in Other. For the years ended December 31, 2018, 2017 and 2016, Other includes losses of $8 million, $77 million and $147 million, respectively, related to Energy Holdings’ investments in leases. For additional information, see Note 8. 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 Power, and PSEG LI’s OSA with LIPA in Other.