Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Allowance For Doubtful Accounts [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 60		$ 63		$ 59
Additions, Charged to cost and expenses	[1]	175		87		91
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[2]	37		90		87
Balance at End of Period		206		60		63
Allowance For Doubtful Accounts [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	[3]	68
Balance at End of Period	[3]			68
Materials And Supplies Valuation Reserve [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		11		9		7
Additions, Charged to cost and expenses		1		3		4
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe		2	[4]	1	[4]	2
Balance at End of Period		10		11		9
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		60		63		59
Additions, Charged to cost and expenses	[5]	175		87		91
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[6]	37		90		87
Balance at End of Period		206		60		63
Public Service Electric and Gas Company | Allowance For Doubtful Accounts [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	[7]	68
Balance at End of Period	[7]			68
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		2		0
Additions, Charged to cost and expenses		0		0		2
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe		0		0		0
Balance at End of Period		2		2		2
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		9		7		7
Additions, Charged to cost and expenses		1		3		2
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[8]	2		1		2
Balance at End of Period		$ 8		$ 9		$ 7

[1] For a discussion of bad debt recoveries, see Note 1. Organization, Basis of Presentation and Summary of Significant Accounting Policies.

[2] Accounts Receivable written off.

[3] Includes $8 million due to the adoption of ASU 2016-13.

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

[5] For a discussion of bad debt recoveries, see Note 1. Organization, Basis of Presentation and Summary of Significant Accounting Policies.

[6] Accounts Receivable written off.

[7] Includes $8 million due to the adoption of ASU 2016-13.

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