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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
Other Financial Data [Abstract]    
Deferred revenue $ 410us-gaap_DeferredRevenueCurrent $ 408us-gaap_DeferredRevenueCurrent
Taxes payable 89us-gaap_AccruedIncomeTaxesCurrent 64us-gaap_AccruedIncomeTaxesCurrent
Deferred tax liabilities 2us-gaap_DeferredTaxLiabilitiesCurrent 2us-gaap_DeferredTaxLiabilitiesCurrent
Other 364us-gaap_OtherAccruedLiabilitiesCurrent 314us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 865us-gaap_OtherLiabilitiesCurrent $ 788us-gaap_OtherLiabilitiesCurrent