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Balance Sheet Components Electric Utility Plant, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Amortization of Intangible Assets	$ 6	$ 6	$ 11	$ 11
Electric utility plant	6,913		6,913		6,811
Construction work in progress	267		267		140
Total cost	7,180		7,180		6,951
Less: accumulated depreciation and amortization	(2,648)		(2,648)		(2,559)
Electric utility plant, net	4,532		4,532		4,392
Expenses related to Cascade Crossing	52	0	52	0
cascade crossing [Member]
Property, Plant and Equipment [Line Items]
Construction work in progress					$ 46

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

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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