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Goodwill and Purchased Intangible Assets - Schedule of Acquired Intangibles (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 1,232 $ 672
Accumulated Amortization (238) (178)
Reseller and Customer Relationships [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 664 328
Accumulated Amortization (50) (37)
Customer Contracts [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 8 years  
Finite-Lived Intangible Assets, Gross 397 275
Accumulated Amortization (150) (118)
Intellectual property [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 89 0
Accumulated Amortization (11) 0
Tradenames [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 74 61
Accumulated Amortization (19) (15)
Non-compete arrangements [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 8 8
Accumulated Amortization $ (8) $ (8)
Minimum [Member] | Intellectual property [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Minimum [Member] | Tradenames [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Minimum [Member] | Non-compete arrangements [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Maximum [Member] | Intellectual property [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 7 years  
Maximum [Member] | Tradenames [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Maximum [Member] | Non-compete arrangements [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years