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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Available-for-sale debt securities, Less than one year | $ 24 |
Available-for-sale debt securities, 1-5 years | 335 |
Available-for-sale debt securities, 6-10 years | 234 |
Available-for-sale debt securities, 11-15 years | 84 |
Available-for-sale debt securities, 16-20 years | 113 |
Available-for-sale debt securities, Over 20 years | 544 |
Total Available-for-Sale Debt Securities | 1,334 | $ 1,147
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Available-for-sale debt securities, Less than one year | 0 |
Available-for-sale debt securities, 1-5 years | 40 |
Available-for-sale debt securities, 6-10 years | 24 |
Available-for-sale debt securities, 11-15 years | 10 |
Available-for-sale debt securities, 16-20 years | 25 |
Available-for-sale debt securities, Over 20 years | 117 |
Total Available-for-Sale Debt Securities | $ 216 | $ 235

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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