Available-For-Sale Securities (Fair Values And Gross Unrealized Gains And Losses For The Securities) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 1,554	$ 1,416
Gross Unrealized Gains	238	303
Gross Unrealized Losses	(12)	(18)
Fair Value	1,780	1,701
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	685	609
Gross Unrealized Gains	220	290
Gross Unrealized Losses	(8)	(2)
Fair Value	897	897
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	430	438
Gross Unrealized Gains	9	3
Gross Unrealized Losses	(1)	(12)
Fair Value	438	429
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	333	285
Gross Unrealized Gains	9	10
Gross Unrealized Losses	(3)	(4)
Fair Value	339	291
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	763	723
Gross Unrealized Gains	18	13
Gross Unrealized Losses	(4)	(16)
Fair Value	777	720
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	106	84
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	106	84
Rabbi Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	177	172
Gross Unrealized Gains	14	10
Gross Unrealized Losses	0	(3)
Fair Value	191	179
Rabbi Trust [Member] \| Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	12	14
Gross Unrealized Gains	11	9
Gross Unrealized Losses	0	0
Fair Value	23	23
Rabbi Trust [Member] \| Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	89	109
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	(2)
Fair Value	91	107
Rabbi Trust [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	74	46
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	(1)
Fair Value	75	46
Rabbi Trust [Member] \| Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	163	155
Gross Unrealized Gains	3	1
Gross Unrealized Losses	0	(3)
Fair Value	166	153
Rabbi Trust [Member] \| Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	2	3
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2	3
Rabbi Trust [Member] \| Power [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 45	$ 39

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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