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Balance Sheet Components Electric Utility Plant, Net (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Electric utility plant	$ 6,726	$ 6,596
Construction work in progress	168	120
Total cost	6,894	6,716
Less: accumulated depreciation and amortization	(2,543)	(2,431)
Electric utility plant, net	$ 4,351	$ 4,285

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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