Revenues Revenues (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($) $ / mwd MW	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / mwd MW		Jun. 30, 2017 USD ($)
Revenues [Line Items]
Lease Receivable adjustment	$ 20	$ 22	$ 55	$ 20		$ 77
Revenue from Contract with Customers	1,962	1,869		4,606		4,235
Revenues Unrelated to Contracts with Customers	54	273		228	[1]	498	[1]
Total Operating Revenues	2,016	2,142		4,834		4,733
Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers	754	757		1,444		1,458
Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers	244	227		1,000		981
Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers	301	307		613		606
Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers	373	302		871		616
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	46	50		105		86
Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers	14	9		61		20
Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers	30	11		94		63
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	200			418	[2]	405	[2]
Other Revenues from Contracts with Customers [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		206
PSE And G [Member]
Revenues [Line Items]
Revenue from Contract with Customers	1,366	1,364		3,199		3,181
Revenues Unrelated to Contracts with Customers	20	29		32		38
Total Operating Revenues	1,386	1,393		3,231		3,219
PSE And G [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers	754	757		1,444		1,458
PSE And G [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers	248	233		1,007		988
PSE And G [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers	301	307		613		606
PSE And G [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
PSE And G [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
PSE And G [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
PSE And G [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
PSE And G [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
PSE And G [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
PSE And G [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers	63	67		135		129
Power [Member]
Revenues [Line Items]
Revenue from Contract with Customers	731	662		1,982		1,670
Revenues Unrelated to Contracts with Customers	36	256		188		517
Total Operating Revenues	767	918		2,170		2,187
Anticipated Contract Revenues	$ 180			$ 180
Power [Member] | PJM [Member] | June 2017 to May 2018 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	205			205
Load (MW) | MW	9,200			9,200
Power [Member] | PJM [Member] | June 2018 to May 2019 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	116			116
Load (MW) | MW	8,900			8,900
Power [Member] | PJM [Member] | June 2019 to May 2020 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	174			174
Load (MW) | MW	7,800			7,800
Power [Member] | PJM [Member] | June 2020 to May 2021 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	178			178
Load (MW) | MW	7,700			7,700
Power [Member] | ISO New England [Member] | June 2017 to May 2018 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	231			231
Power [Member] | ISO New England [Member] | June 2018 to May 2019 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	314			314
Load (MW) | MW	820			820
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
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
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
Power [Member] | ISO New England [Member] | June 2022 to May 2023 [Member]
Revenues [Line Items]
Dollars Per Megawatt-Day | $ / mwd	231			231
Load (MW) | MW	480			480
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
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
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
Power [Member] | Electric Distribution Contracts [Member]
Revenues [Line Items]
Revenue from Contract with Customers	$ 0	0		$ 0		0
Power [Member] | Gas Distribution [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
Power [Member] | Electric Transmission [Member]
Revenues [Line Items]
Revenue from Contract with Customers	0	0		0		0
Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers	373	302		871		616
Power [Member] | Electricity and Related Products [Member] | PJM [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers	147	171		323		355
Power [Member] | Electricity and Related Products [Member] | NY ISO [Member]
Revenues [Line Items]
Revenue from Contract with Customers	46	50		105		86
Power [Member] | Electricity and Related Products [Member] | ISO New England [Member]
Revenues [Line Items]
Revenue from Contract with Customers	14	9		61		20
Power [Member] | Gas Sales [Member] | Third Party Sales [Member]
Revenues [Line Items]
Revenue from Contract with Customers	30	11		94		63
Power [Member] | Gas Sales [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers	108	107		505		508
Power [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers	13			23		22
Power [Member] | Other Revenues from Contracts with Customers [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		12
Other [Member]
Revenues [Line Items]
Revenue from Contract with Customers	125	128		262		256
Revenues Unrelated to Contracts with Customers	(2)	(12)		8		(57)
Total Operating Revenues	123	116		270		199
Anticipated Contract Revenues	64			64
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	125			262		256
Other [Member] | Other Revenues from Contracts with Customers [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		128
Eliminations [Member]
Revenues [Line Items]
Revenue from Contract with Customers	(260)	(285)		(837)		(872)
Revenues Unrelated to Contracts with Customers	0	0		0		0
Total Operating Revenues	(260)	(285)		(837)		(872)
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	(4)	(6)		(7)		(7)
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	(147)	(171)		(323)		(355)
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	(108)	(107)		(505)		(508)
Eliminations [Member] | Other Revenues from Contracts with Customers [Member]
Revenues [Line Items]
Revenue from Contract with Customers	$ (1)			$ (2)		$ (2)
Eliminations [Member] | Other Revenues from Contracts with Customers [Member] | Sales to Affiliates [Member]
Revenues [Line Items]
Revenue from Contract with Customers		$ (1)

[1] Includes primarily alternative revenues at PSE&G, derivative contracts at Power, and lease contracts in Other. For the three and six months ended June 30, 2018, Other includes a $20 million loss and for the three and six months ended June 30, 2017, Other includes a $22 million loss and a $77 million loss, respectively, related to Energy Holdings’ investments in leases.

[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.