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Other Financial Data Schedule of Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Other Financial Data [Abstract] |  |
Deferred revenue | $ 410 us-gaap_DeferredRevenueCurrent | $ 408 us-gaap_DeferredRevenueCurrent
Taxes payable | 89 us-gaap_AccruedIncomeTaxesCurrent | 64 us-gaap_AccruedIncomeTaxesCurrent
Deferred tax liabilities | 2 us-gaap_DeferredTaxLiabilitiesCurrent | 2 us-gaap_DeferredTaxLiabilitiesCurrent
Other | 364 us-gaap_OtherAccruedLiabilitiesCurrent | 314 us-gaap_OtherAccruedLiabilitiesCurrent
Total | $ 865 us-gaap_OtherLiabilitiesCurrent | $ 788 us-gaap_OtherLiabilitiesCurrent

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(1) -Article 7 + Details
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