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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Trust Investments |  |  |  |  |  | $ 862 | $ 1,229
Net Gains (Losses) on Trust Investments |  | $ (187) |  | $ 81 |  | (255) | 141
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Trust Investments | [1] | 341 |  | 538 |  | 814 | 1,135
Gross Realized Gains |  | 21 |  | 83 |  | 50 | 162
Gross Realized Losses |  | (31) |  | (23) |  | (65) | (38)
Net Realized Gains (Losses) | [2] | (10) |  | 60 |  | (15) | 124
Unrealized Gain (Loss) on Equity Securities |  | (170) |  | 20 |  | (231) | 13
Net Gains (Losses) on Trust Investments |  | (180) |  | 80 |  | (246) | 137
Rabbi Trust [Member] |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Trust Investments |  | 20 | [1] | 29 | [1] | 48 | 94
Gross Realized Gains |  | 2 |  | 2 |  | 3 | 7
Gross Realized Losses |  | (4) |  | (1) |  | (6) | (3)
Net Realized Gains (Losses) | [3] | (2) |  | 1 |  | (3) | 4
Unrealized Gain (Loss) on Equity Securities |  | (5) |  | 0 |  | (6) | 0
Net Gains (Losses) on Trust Investments |  | $ (7) |  | $ 1 |  | $ (9) | $ 4
[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.

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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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- Definition Amount of realized loss 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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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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