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Acquisitions/Divestitures (Divestiture) (Details 6) - Disposal group disposed of by sale, not discontinued operations - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 10, 2013
Apr. 17, 2012
Dec. 31, 2015
Dec. 31, 2014
Retail Stores Solutions business        
Divestitures        
Pre-tax gain on sale of business     $ 8  
Cumulative pre-tax gain/(loss) on sale of business     519  
Ownership retention period   3 years    
Customer Care Business Process Outsourcing Services        
Divestitures        
Transaction price for sale of business $ 501      
Approximate amount of transaction price received in cash 430      
Noncash consideration received on sale of business $ 71      
Pre-tax gain on sale of business     7 $ 202
Cumulative pre-tax gain/(loss) on sale of business     $ 209  
Customer Care Business Process Outsourcing Services | Maximum        
Divestitures        
Equity Ownership percent acquired 5.00%