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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
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sale of Trust Investments |  | $ 501 | $ 662
Net Gains (Losses) on Trust Investments |  | (68) | 60
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sale of Trust Investments | [1] | 473 | 597
Gross Realized Gains |  | 29 | 79
Gross Realized Losses |  | (34) | (15)
Net Realized Gains (Losses) | [2] | (5) | 64
Unrealized Gain (Loss) on Equity Securities |  | (61) | (7)
Net Gains (Losses) on Trust Investments |  | (66) | 57
Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Proceeds from Sale of Trust Investments |  | 28 | 65
Gross Realized Gains |  | 1 | 5
Gross Realized Losses |  | (2) | (2)
Net Realized Gains (Losses) |  | (1) | 3
Unrealized Gain (Loss) on Equity Securities |  | (1) | 0
Net Gains (Losses) on Trust Investments |  | $ (2) | $ 3
[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.

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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