Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Trust Investments [Line Items]
Proceeds from Sale of Trust Investments				$ 814	$ 721
Net Gains (Losses) on Trust Investments		$ 7	$ 57	102	103
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sale of Trust Investments	[1]	439	308	799	704
Gross Realized Gains		46	25	77	46
Gross Realized Losses		(17)	(28)	(31)	(55)
Net Realized Gains (Losses)	[2]	29	(3)	46	(9)
Unrealized Gain (Loss) on Equity Securities		(23)	60	55	111
Net Gains (Losses) on Trust Investments		6	57	101	102
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Proceeds from Sale of Trust Investments		6	11	15	17
Gross Realized Gains		1	3	2	4
Gross Realized Losses		0	(4)	(1)	(5)
Net Realized Gains (Losses)	[3]	1	(1)	1	(1)
Unrealized Gain (Loss) on Equity Securities		0	1	0	2
Net Gains (Losses) on Trust Investments		$ 1	$ 0	$ 1	$ 1

[1] Includes activity in accounts related to the liquidation of funds being transitioned within the trust.

[2] The cost of these securities was determined on the basis of specific identification.

[3] The cost of these securities was determined on the basis of specific identification.