Available-For-Sale Securities (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Rabbi Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Less than one year	$ 1
Available-for-sale debt securities, 1-5 years	37
Available-for-sale debt securities, 6-10 years	30
Available-for-sale debt securities, 11-15 years	5
Available-for-sale debt securities, 16-20 years	18
Available-for-sale debt securities, Over 20 years	113
Total Available-for-Sale Debt Securities	204
Power [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Less than one year	42
Available-for-sale debt securities, 1-5 years	320
Available-for-sale debt securities, 6-10 years	207
Available-for-sale debt securities, 11-15 years	40
Available-for-sale debt securities, 16-20 years	65
Available-for-sale debt securities, Over 20 years	312
Total Available-for-Sale Debt Securities	$ 986

Available For Sale Securities Debt Maturities After Fifteen Through Twenty Years Fair Value

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Available For Sale Securities Debt Maturities After Ten Through Fifteen Years Fair Value

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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