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Other Financial Data - Schedule of Other Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Financial Data [Abstract]    
Deferred revenue $ 408us-gaap_DeferredRevenueCurrent $ 475us-gaap_DeferredRevenueCurrent
Taxes payable 66us-gaap_AccruedIncomeTaxesCurrent 184us-gaap_AccruedIncomeTaxesCurrent
Other 314us-gaap_OtherAccruedLiabilitiesCurrent 247us-gaap_OtherAccruedLiabilitiesCurrent
Total Other Current Liabilities $ 788us-gaap_OtherLiabilitiesCurrent $ 906us-gaap_OtherLiabilitiesCurrent