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Acquisitions/Divestitures: (Details 2) (USD $)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Retail Stores Solutions business
Sep. 30, 2012
Total Estimated
Retail Stores Solutions business
Divestitures        
Proceeds from sale of business $ 587 $ 4 $ 572  
Note receivable on sale of business     251  
Pre-tax gain on sale of business     $ 447 $ 500