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Acquisitions/Divestitures: (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
item
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Completed technology
Jun. 30, 2013
Completed technology
Minimum
Jun. 30, 2013
Completed technology
Maximum
Jun. 30, 2013
Patents/trademarks
Jun. 30, 2013
Patents/trademarks
Minimum
Jun. 30, 2013
Patents/trademarks
Maximum
Jun. 30, 2013
Software
item
Dec. 31, 2012
Software
Dec. 31, 2011
Software
Jun. 30, 2013
Other Acquisitions
Software
Jul. 08, 2013
SoftLayer
Forecast
Acquisitions:                            
Businesses acquired, number (in entities) 3                 3        
Businesses acquired, aggregate cost $ 101                          
Acquired intangible asset, weighted average useful life 6 years 7 months 6 days       5 years 7 years   3 years 7 years          
Current assets 7                          
Fixed assets/noncurrent assets 14                          
Goodwill 28,846 29,247 26,213             20,164 20,405 18,121 75  
Intangible assets       11     4              
Total assets acquired 111                          
Current liabilities (3)                          
Noncurrent liabilities (7)                          
Total liabilities assumed (10)                          
Total purchase price $ 101                         $ 2,000
Expected percent of goodwill deductible for tax purposes 8.00%