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Stock-Based Compensation: (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Stock-based compensation cost, allocation of recognized costs    
Pre-tax stock-based compensation cost $ 168 $ 170
Income tax benefits (60) (61)
Total Stock-based compensation cost 108 108
Stock-based compensation cost, increase (decrease) related to the company's assumption of stock-based awards previously issued by acquired entities (2)  
Stock-based compensation cost, unrecognized, related to non-vested awards. 1,033.0  
Stock-based compensation cost, unrecognized, related to non-vested awards, weighted-average period of recognition (in years) 3  
Cost
   
Stock-based compensation cost, allocation of recognized costs    
Pre-tax stock-based compensation cost 34 24
Selling, general and administrative
   
Stock-based compensation cost, allocation of recognized costs    
Pre-tax stock-based compensation cost 119 130
Research, development and engineering
   
Stock-based compensation cost, allocation of recognized costs    
Pre-tax stock-based compensation cost $ 15 $ 16