Related-Party Transactions Related-Party Revenues and Expenses (Details) - Power [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Billings To PSE&G through BGSS and BGS		$ 1,630	[1]	$ 1,771	$ 1,797	[1]
Administrative Billings from Services	[2]	$ 187		$ 165	$ 178

[1] PSE&G has entered into a requirements contract with Power under which Power provides the gas supply services needed to meet PSE&G’s BGSS and other contractual requirements. Power has also entered into contracts to supply energy, capacity and ancillary services to PSE&G through the BGS auction process.

[2] Services provides and bills administrative services to PSE&G and Power at cost. In addition, PSE&G and Power have other payables to Services, including amounts related to certain common costs, such as pension and OPEB costs, which Services pays on behalf of each of the operating companies.