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Business Combinations, Intangibles and Goodwill - Allocation of Purchase Price (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Purchased technology
Sep. 30, 2014
Customer relationships and customer lists
Sep. 30, 2014
Trademarks and tradenames
Sep. 30, 2014
Other
Feb. 24, 2014
VMware
AirWatch
Feb. 24, 2014
VMware
Purchased technology
AirWatch
Feb. 24, 2014
VMware
Customer relationships and customer lists
AirWatch
Feb. 24, 2014
VMware
Trademarks and tradenames
AirWatch
Feb. 24, 2014
VMware
Other
AirWatch
Business Acquisition [Line Items]                  
Weighted-average useful life 6 years 8 years 8 years 3 years          
Other current assets         $ 60        
Intangible assets         250 118 78 40 14
Goodwill         879        
Other assets         17        
Total assets acquired         1,206        
Unearned revenue         (45)        
Other assumed liabilities, net of acquired assets         (69)        
Total net liabilities assumed         (114)        
Fair value of assets acquired and net liabilities assumed         $ 1,092