Trust Investments (Fair Value Of Rabbi Trust) (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Trust Investments [Line Items]
Rabbi Trust	$ 242	$ 266
Public Service Electric and Gas Company
Schedule of Trust Investments [Line Items]
Rabbi Trust	43	51
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	242	266
Rabbi Trust [Member] \| Public Service Electric and Gas Company
Schedule of Trust Investments [Line Items]
Rabbi Trust	43	51
Rabbi Trust [Member] \| Other [Member]
Schedule of Trust Investments [Line Items]
Rabbi Trust	$ 199	$ 215

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Name:	us-gaap_AssetsHeldInTrustNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant