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Commitments And Contingencies (Asset Sale) (Details) (USD $) In Millions, unless otherwise specified			1 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Feb. 29, 2012 Medina Valley Energy Center [Member]	Jun. 30, 2013 Medina Valley Energy Center [Member]
Loss Contingencies [Line Items]
Proceeds from sale of property, plant, and equipment			$ 16
Nontrade Receivables			1
Pretax gain from asset sale			10
Receivable, charge-offs				1
Current liabilities of discontinued operations	$ 1,183	$ 1,166

Carrying value as of the balance sheet date of current obligations (due less than one year or one operating cycle, if longer) arising from the sale, disposal or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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