Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Allowance For Doubtful Accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 63		$ 59		$ 68
Additions, Charged to cost and expenses		87		91		76
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[1]	90		87		85
Balance at End of Period		60		63		59
Materials And Supplies Valuation Reserve [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		9		7		37
Additions, Charged to cost and expenses		3		4		2
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe		1	[2]	2	[2]	32	[3]
Balance at End of Period		11		9		7
Public Service Electric and Gas Company | Allowance For Doubtful Accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		63		59		68
Additions, Charged to cost and expenses		87		91		76
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[4]	90		87		85
Balance at End of Period		60		63		59
Public Service Electric and Gas Company | Materials And Supplies Valuation Reserve [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		2		0		0
Additions, Charged to cost and expenses		0		2		0
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe		0		0		0
Balance at End of Period		2		2		0
PSEG Power LLC | Materials And Supplies Valuation Reserve [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		7		7		37
Additions, Charged to cost and expenses		3		2		2
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[5]	1		2		32
Balance at End of Period		$ 9		$ 7		$ 7

[1] Accounts Receivable written off.

[2] Reduce reserve to appropriate level and to remove obsolete inventory.

[3] Hudson and Mercer inventory written off.

[4] ccounts Receivable written off.

[5] Reduce reserve to appropriate level and to remove obsolete inventory.