Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 68		$ 67		$ 52
Additions, Charged to cost and expenses		76		85		101
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[1]	85		84		86
Balance at End of Period		59		68		67
Materials And Supplies Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		37		11		15
Additions, Charged to cost and expenses		2		32		2
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[2]	32		6		6
Balance at End of Period		7		37		11
PSE&G [Member] | Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		68		67		52
Additions, Charged to cost and expenses		76		85		101
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[3]	85		84		86
Balance at End of Period		59		68		67
PSE&G [Member] | Materials And Supplies Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		0		1		2
Additions, Charged to cost and expenses		0		0		0
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe		0	[2]	1	[2]	1
Balance at End of Period		0		0		1
Power [Member] | Materials And Supplies Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		37		10		13
Additions, Charged to cost and expenses		2		32		2
Additions, Charged to other accounts-describe		0		0		0
Deductions-describe	[4]	32		5		5
Balance at End of Period		$ 7		$ 37		$ 10

[1] Accounts Receivable written off.

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmI4NjU0MDY5NmJhOTRjNmFhZjdmZjU5NTcyZGRhNzZlfFRleHRTZWxlY3Rpb246Q0Y5OEI2QjMwQjQ1MTIzNzg1QjZDMzlDRjkxNTQzQTIM}

[3] Accounts Receivable written off.

[4] Hudson and Mercer inventory written off.(B)Reduce reserve to appropriate level and to remove obsolete inventory.