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Segments: (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Information        
Pre-tax income $ 5,161 $ 4,885 $ 8,997 $ 8,702
Total segments
       
Segment Information        
External revenue 25,608 26,476 50,120 50,892
Internal revenue 1,921 2,082 3,872 4,160
Total revenue reportable segments 27,529 28,558 53,991 55,052
Pre-tax income 5,814 5,370 10,248 9,634
Revenue year-to-year change (as a percent) (3.60%)   (1.90%)  
Pre-tax income year-to-year change (as a percent) 8.30%   6.40%  
Pre-tax income margin (as a percent) 21.10% 18.80% 19.00% 17.50%
Global Technology Services
       
Segment Information        
External revenue 9,995 10,241 20,031 20,104
Internal revenue 291 320 584 627
Total revenue reportable segments 10,286 10,561 20,615 20,732
Pre-tax income 1,757 1,420 3,237 2,658
Revenue year-to-year change (as a percent) (2.60%)   (0.60%)  
Pre-tax income year-to-year change (as a percent) 23.70%   21.80%  
Pre-tax income margin (as a percent) 17.10% 13.40% 15.70% 12.80%
Global Business Services
       
Segment Information        
External revenue 4,667 4,866 9,304 9,575
Internal revenue 180 205 363 405
Total revenue reportable segments 4,847 5,071 9,667 9,980
Pre-tax income 803 750 1,404 1,390
Revenue year-to-year change (as a percent) (4.40%)   (3.10%)  
Pre-tax income year-to-year change (as a percent) 7.00%   1.00%  
Pre-tax income margin (as a percent) 16.60% 14.80% 14.50% 13.90%
Software
       
Segment Information        
External revenue 6,171 6,169 11,770 11,478
Internal revenue 776 792 1,615 1,621
Total revenue reportable segments 6,946 6,961 13,386 13,099
Pre-tax income 2,493 2,310 4,438 4,045
Revenue year-to-year change (as a percent) (0.20%)   2.20%  
Pre-tax income year-to-year change (as a percent) 7.90%   9.70%  
Pre-tax income margin (as a percent) 35.90% 33.20% 33.20% 30.90%
Systems and Technology
       
Segment Information        
External revenue 4,259 4,681 8,008 8,700
Internal revenue 159 218 309 462
Total revenue reportable segments 4,418 4,899 8,317 9,162
Pre-tax income 234 393 130 525
Revenue year-to-year change (as a percent) (9.80%)   (9.20%)  
Pre-tax income year-to-year change (as a percent) (40.40%)   (75.30%)  
Pre-tax income margin (as a percent) 5.30% 8.00% 1.60% 5.70%
Global Financing
       
Segment Information        
External revenue 517 519 1,006 1,035
Internal revenue 515 547 1,000 1,044
Total revenue reportable segments 1,032 1,066 2,006 2,079
Pre-tax income $ 528 $ 496 $ 1,040 $ 1,015
Revenue year-to-year change (as a percent) (3.20%)   (3.50%)  
Pre-tax income year-to-year change (as a percent) 6.40%   2.40%  
Pre-tax income margin (as a percent) 51.10% 46.50% 51.80% 48.80%