Trust Investments (Fair Value Of Rabbi Trust) (Detail) - Rabbi Trust [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 224	$ 231
Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	56	57
PSE&G [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	45	46
Other [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 123	$ 128