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Acquisitions/Divestitures (Divestitures) (Details 4) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Dec. 31, 2015
Discontinued Operations          
Impairment of long-lived asstes     $ 0    
Microelectronics business | Discontinued operations          
Discontinued Operations          
Description of continuing involvement after transaction The transaction includes a 10-year exclusive manufacturing sourcing agreement in which GLOBALFOUNDRIES will provide server processor semiconductor technology for use in IBM Systems. The agreement provides the company with capacity and market-based pricing for current semiconductor nodes in production and progression to nodes in the future for both development and production needs. As part of the transaction, the company will provide GLOBALFOUNDRIES with certain transition services, including IT, supply chain, packaging and test services and lab services. The initial term for these transition services is one to three years, with GLOBALFOUNDRIES having the ability to renew.        
Discontinued operation, period of exclusive manufacturing agreement after disposal 10 years        
Pre-tax charge (credit) related to sale $ (1)   $ 14 $ 4,700 $ 116
Impairment of long-lived asstes       2,400  
Total cash consideration expected to be transferred to acquiring company       1,500  
Other related costs       $ 800  
Cumulative pre-tax charge $ 4,800        
Net cash transferred   $ 515      
Cash consideration payable at closing date   $ 750      
Period of time over which cash consideration is expected to be transferred 2 years        
Microelectronics business | Minimum | Discontinued operations          
Discontinued Operations          
Discontinued operation, period of continuing involvement after disposal 1 year        
Microelectronics business | Maximum | Discontinued operations          
Discontinued Operations          
Discontinued operation, period of continuing involvement after disposal 3 years