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Balance Sheet Components Allowance for Uncollectible Accounts (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Allowance for Uncollectible Accounts
Balance as of begining of period	$ 6	$ 5
Provision, net	5	4
Amounts written off, less recoveries	(5)	(4)
Balance as of end of period	$ 6	$ 5

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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