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Balance Sheet Components Electric Utility Plant, Net (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Electric utility plant	$ 6,458	$ 6,279
Less: accumulated depreciation and amortization	2,352	2,271
Total cost	6,579	6,404
Construction work in progress	121	125
Electric utility plant, net	$ 4,227	$ 4,133

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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