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Balance Sheet Components Electric Utility Plant, Net (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Electric utility plant	$ 6,630	$ 6,596
Construction work in progress	129	120
Total cost	6,759	6,716
Less: accumulated depreciation and amortization	(2,471)	(2,431)
Electric utility plant, net	$ 4,288	$ 4,285

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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