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Acquisitions/Divestitures (Purchase Price allocation) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Completed technology
Minimum
Sep. 30, 2013
Completed technology
Maximum
Sep. 30, 2013
Client relationships
Sep. 30, 2013
Patents/trademarks
Minimum
Sep. 30, 2013
Patents/trademarks
Maximum
Sep. 30, 2013
Software
Dec. 31, 2012
Software
Dec. 31, 2011
Software
Sep. 30, 2013
Global Technology Services
Dec. 31, 2012
Global Technology Services
Dec. 31, 2011
Global Technology Services
Sep. 30, 2013
Systems and Technology
Dec. 31, 2012
Systems and Technology
Dec. 31, 2011
Systems and Technology
Sep. 30, 2013
Other Acquisitions
Sep. 30, 2013
Other Acquisitions
Completed technology
Sep. 30, 2013
Other Acquisitions
Client relationships
Sep. 30, 2013
Other Acquisitions
Patents/trademarks
Sep. 30, 2013
Other Acquisitions
Software
Sep. 30, 2013
Other Acquisitions
Systems and Technology
Jul. 03, 2013
SoftLayer Technologies Inc
Sep. 30, 2013
SoftLayer Technologies Inc
Sep. 30, 2013
SoftLayer Technologies Inc
Completed technology
Sep. 30, 2013
SoftLayer Technologies Inc
Client relationships
Sep. 30, 2013
SoftLayer Technologies Inc
In-process R&D
Sep. 30, 2013
SoftLayer Technologies Inc
Patents/trademarks
Jul. 03, 2013
SoftLayer Technologies Inc
Software
Jul. 03, 2013
SoftLayer Technologies Inc
Global Technology Services
Business Acquisition [Line Items]                                                              
Current assets                                   $ 70             $ 80            
Fixed assets/noncurrent assets                                   18             301            
Goodwill 30,882 29,247 26,213           20,818 20,405 18,121 4,126 2,916 2,646 1,607 1,568 1,133 551       538 13 1,284 1,284         39 1,245
Intangible assets                                     126 59 22         290 245 2 75    
Total assets acquired                                   846             2,277            
Current liabilities                                   (20)             (56)            
Noncurrent liabilities                                   (69)             (244)            
Total liabilities assumed                                   (89)             (300)            
Total purchase price                                   $ 757           $ 1,977 $ 1,977            
Acquired intangible asset, weighted average useful life       5 years 7 years 7 years 2 years 7 years                   6 years 6 months           7 years