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Balance Sheet Components Allowance for Uncollectible Accounts (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Allowance for Uncollectible Accounts
Balance as of begining of period	$ 5	$ 5
Provision, net	3	3
Amounts written off, less recoveries	(3)	(3)
Balance as of end of period	$ 5	$ 5

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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