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Retirement-Related Benefits: (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Retirement-related plans cost        
Defined benefit and contribution pension plan - cost $ 612 $ 357 $ 1,602 $ 1,159
Nonpension postretirement plans - cost 86 87 260 261
Total 698 444 1,862 1,419
Year-to-year percent change, defined benefit and contribution pension plans cost 71.30%   38.30%  
Year-to-year percent change, Nonpension postretirement plans cost (1.60%)   (0.40%)  
Year-to-year percent change, total 57.00%   31.20%  
Proceeds from Medicare Prescription Drug Improvement and Modernization Act of 2003 21.5   42.4  
Litigation in United Kingdom regarding defined benefit plans (C Plan)
       
Retirement-related plans cost        
Multi-employer plan/other costs 162      
Defined Benefit Pension Plans | U.S. Plan(s)
       
Retirement-related plans cost        
Interest cost 549 614 1,647 1,842
Expected return on plan assets (1,011) (1,011) (3,033) (3,032)
Amortization of prior service costs/(credits) 2 2 7 7
Recognized actuarial losses 333 205 998 614
Total net periodic pension (income)/cost of defined benefit plans (127) (190) (381) (569)
Cost of defined contribution plans 209 218 686 698
Defined benefit and contribution pension plan - cost 82 28 305 129
Defined Benefit Pension Plans | Non-U.S. Plans
       
Retirement-related plans cost        
Service cost 109 128 332 384
Interest cost 439 467 1,332 1,391
Expected return on plan assets (570) (641) (1,723) (1,904)
Amortization of prior service costs/(credits) (39) (41) (116) (121)
Recognized actuarial losses 255 240 770 727
Curtailments and settlements 0 0 1 1
Multi-employer plan/other costs 188 [1] 21 234 [1] 94
Total net periodic pension (income)/cost of defined benefit plans 381 173 831 572
Cost of defined contribution plans 148 156 467 458
Defined benefit and contribution pension plan - cost 530 329 1,297 1,030
Expected current year contributions to non-U.S. defined benefit plans 700   700  
Year-to-date contributions to non-U.S. defined benefit plans     476  
Defined Benefit Pension Plans | Non-U.S. Plans | Litigation in United Kingdom regarding defined benefit plans (C Plan)
       
Retirement-related plans cost        
Multi-employer plan/other costs 162   162  
Nonpension Postretirement Plans | U.S. Plan(s)
       
Retirement-related plans cost        
Service cost 9 9 28 25
Interest cost 50 59 150 177
Recognized actuarial losses 8   24  
Nonpension postretirement plans - cost 67 68 201 202
Nonpension Postretirement Plans | Non-U.S. Plans
       
Retirement-related plans cost        
Service cost 2 3 7 8
Interest cost 16 17 48 51
Expected return on plan assets (2) (3) (7) (8)
Amortization of prior service costs/(credits) (1) (1) (3) (3)
Recognized actuarial losses 4 4 13 11
Nonpension postretirement plans - cost $ 19 $ 20 $ 58 $ 59
[1] Includes a $162 million charge related to litigation involving one of IBM UK's defined benefit plans. See Note 12, "Contingencies," and Note 14, "Subsequent Events," for additional information.