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Balance Sheet Components Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Allowance for Uncollectible Accounts
Balance as of begining of period	$ 6	$ 6
Provision, net	3	4
Amounts written off, less recoveries	(3)	(3)
Balance as of end of period	$ 6	$ 7

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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