Trust Investments (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Accounts Receivable	$ 1	$ 1
Accounts Payable	0	0
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Accounts Receivable	19	14
Accounts Payable	$ 6	$ 6