Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	$ 13
Available-for-sale debt securities, 1-5 years	254
Available-for-sale debt securities, 6-10 years	211
Available-for-sale debt securities, 11-15 years	40
Available-for-sale debt securities, 16-20 years	77
Available-for-sale debt securities, Over 20 years	383
Total Available-for-Sale Debt Securities	978
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	1
Available-for-sale debt securities, 1-5 years	35
Available-for-sale debt securities, 6-10 years	27
Available-for-sale debt securities, 11-15 years	8
Available-for-sale debt securities, 16-20 years	21
Available-for-sale debt securities, Over 20 years	109
Total Available-for-Sale Debt Securities	201
Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 1,878

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