Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Cost	$ 1,785	$ 1,794
Gross Unrealized Gains	312	350
Gross Unrealized Losses	(48)	(11)
Fair Value	2,049	2,133
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	471	497
Gross Unrealized Gains	235	245
Gross Unrealized Losses	(8)	(2)
Fair Value	698	740
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	321	311
Gross Unrealized Gains	76	99
Gross Unrealized Losses	(14)	(3)
Fair Value	383	407
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	792	808
Gross Unrealized Gains	311	344
Gross Unrealized Losses	(22)	(5)
Fair Value	1,081	1,147
Unrealized Gains (Losses) on Equity Securities still held	(3)
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Government [Member]
Schedule of Trust Investments [Line Items]
Cost	528	586
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(12)	(4)
Fair Value	517	584
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Corporate [Member]
Schedule of Trust Investments [Line Items]
Cost	464	400
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(14)	(2)
Fair Value	450	402
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Total Debt Securities [Member]
Schedule of Trust Investments [Line Items]
After tax amount of net unrealized gains recognized in AOCI	(14)
Cost	992	986
Gross Unrealized Gains	1	6
Gross Unrealized Losses	(26)	(6)
Fair Value	967	986
Nuclear Decommissioning Trust (NDT) Fund [Member] \| Power [Member] \| Other Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	1
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	1
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Cost	227	227
Gross Unrealized Gains	3	6
Gross Unrealized Losses	(6)	(2)
Fair Value	224	231
Rabbi Trust [Member] \| Domestic Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	21	24
Gross Unrealized Gains	3	3
Gross Unrealized Losses	0	0
Fair Value	24	27
Rabbi Trust [Member] \| International Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	0
Rabbi Trust [Member] \| Equity Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	21	24
Gross Unrealized Gains	3	3
Gross Unrealized Losses	0	0
Fair Value	24	27
Unrealized Gains (Losses) on Equity Securities still held	1
Rabbi Trust [Member] \| Debt Securities [Member]
Schedule of Trust Investments [Line Items]
After tax amount of net unrealized gains recognized in AOCI	(4)
Rabbi Trust [Member] \| Government [Member]
Schedule of Trust Investments [Line Items]
Cost	96	85
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(2)	(1)
Fair Value	94	85
Rabbi Trust [Member] \| Corporate [Member]
Schedule of Trust Investments [Line Items]
Cost	110	118
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(4)	(1)
Fair Value	106	119
Rabbi Trust [Member] \| Total Debt Securities [Member]
Schedule of Trust Investments [Line Items]
Cost	206	203
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(6)	(2)
Fair Value	200	204
Rabbi Trust [Member] \| Power [Member]
Schedule of Trust Investments [Line Items]
Fair Value	$ 56	$ 57

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

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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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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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