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Acquisitions/Divestitures (Purchase Price allocation) (Details 2) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Acquisitions
Sep. 30, 2014
Acquisitions
Completed technology
Sep. 30, 2014
Acquisitions
Completed technology
Minimum
Sep. 30, 2014
Acquisitions
Completed technology
Maximum
Sep. 30, 2014
Acquisitions
Client relationships
Sep. 30, 2014
Acquisitions
Patents/trademarks
Sep. 30, 2014
Acquisitions
Patents/trademarks
Minimum
Sep. 30, 2014
Acquisitions
Patents/trademarks
Maximum
Acquisitions:                      
Current assets       $ 56              
Fixed assets/noncurrent assets       39              
Goodwill 31,045 31,184 29,247 445              
Intangible assets         68     77 18    
Total assets acquired       705              
Current liabilities       (26)              
Noncurrent liabilities       (70)              
Total liabilities assumed       (96)              
Total purchase price       $ 608              
Acquired intangible asset, weighted average useful life       6 years 10 months   5 years 7 years 7 years   1 year 7 years