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Stock-Based Compensation: (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
Stock-based compensation cost, allocation of recognized costs        
Pre-tax stock-based compensation cost $ 160 $ 162 $ 328 $ 332
Income tax benefits (56) (59) (116) (120)
Total Stock-based compensation cost 104 104 212 212
Stock-based compensation cost, increase (decrease) related to the company's assumption of stock-based awards previously issued by acquired entities (1)   (3)  
Stock-based compensation cost, unrecognized, related to non-vested awards. 1,411   1,411  
Remaining weighted-average contractual term of RSUs     3 years  
Cost
       
Stock-based compensation cost, allocation of recognized costs        
Pre-tax stock-based compensation cost 30 22 64 46
Selling, general and administrative
       
Stock-based compensation cost, allocation of recognized costs        
Pre-tax stock-based compensation cost 117 126 236 256
Research, development and engineering
       
Stock-based compensation cost, allocation of recognized costs        
Pre-tax stock-based compensation cost $ 12 $ 14 $ 27 $ 30