Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2020	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect Adjustment	$ (2)		$ 81
Public Service Electric and Gas Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect Adjustment	(2)
PSEG Power [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect Adjustment			$ 69	$ 0
Goodwill, Impairment Loss	$ 16
Allowance for Credit Losses [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect Adjustment		$ 8
Other Regulatory Assets (Liabilities) [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect Adjustment		6
Other Assets [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect Adjustment		$ 2