Trust Investments (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Accounts Receivable	$ 18	$ 14
Accounts Payable	12	6
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Accounts Receivable	1	1
Accounts Payable	$ 0	$ 0