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Condensed Consolidated Financial Statement Details - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Property, Plant and Equipment [Line Items]    
Capital lease obligations (less than $1 million during the months ended March 31, 2016) $ 74 $ 1
Amortization expense of intangible assets 174  
Customer Relationships    
Property, Plant and Equipment [Line Items]    
Finite-lived intangible assets, net 4,364  
Trademarks    
Property, Plant and Equipment [Line Items]    
Finite-lived intangible assets, net 54  
Trademarks    
Property, Plant and Equipment [Line Items]    
Indefinite-lived intangible assets $ 80