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Acquisitions/Divestitures (Purchase Price allocation) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Acquisitions
Mar. 31, 2014
Acquisitions
Completed technology
Mar. 31, 2014
Acquisitions
Client relationships
Mar. 31, 2014
Acquisitions
Patents/trademarks
Mar. 31, 2014
Acquisitions
Patents/trademarks
Minimum
Mar. 31, 2014
Acquisitions
Patents/trademarks
Maximum
Acquisitions:                  
Current assets       $ 21          
Fixed assets/noncurrent assets       18          
Goodwill 31,214 31,184 29,247 239          
Intangible assets         33 1 8    
Total assets acquired       319          
Current liabilities       (11)          
Noncurrent liabilities       (22)          
Total liabilities assumed       (33)          
Total purchase price       $ 286          
Acquired intangible asset, weighted average useful life       6 years 10 months 7 years 7 years   5 years 7 years