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Subsequent Events: (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 1 Months Ended 1 Months Ended
Apr. 30, 2012
Dividend declared
Apr. 24, 2012
Dividend declared
Dec. 31, 2011
Dividend declared
Apr. 30, 2012
Stock repurchase authorized
Apr. 30, 2012
Agreement for sale of Retail Store Solutions business
Apr. 17, 2012
Agreement for sale of Retail Store Solutions business
Apr. 30, 2012
Agreement for sale of Retail Store Solutions business
Maximum
Apr. 30, 2012
Agreement for sale of Retail Store Solutions business
Minimum
Subsequent events:                
Subsequent event, amount reported       $ 7,000 $ 850      
Approximate amount of transaction price expected to be received in cash         800      
Ownership percentage to be received in sale of business transaction           19.90%    
Period of ownership percentage in new holding company (in years)         3 years      
Expected gain (loss) on sale             $ 550 $ 450
Dividend declared (in dollars per share)   $ 0.85 $ 0.75          
Subsequent event, date Apr. 24, 2012              
Dividend payable, date Jun. 09, 2012              
Subsequent event per share amount increase (in dollars per share) $ 0.10              
Percentage of subsequent event per share amount increase (as a percent) 13.00%