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Balance Sheet Components (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Allowance for Doubtful Accounts Receivable, Current |  | $ 6 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 6 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 5 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 6 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Proceeds from Legal Settlements | $ 50 us-gaap_ProceedsFromLegalSettlements | $ 6 us-gaap_ProceedsFromLegalSettlements | $ 44 us-gaap_ProceedsFromLegalSettlements | $ 0 us-gaap_ProceedsFromLegalSettlements |

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration