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Commitments And Contingencies (Asset Sale) (Details) (Medina Valley Energy Center [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 29, 2012	Mar. 31, 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

- 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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