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Stock-Based Compensation (Stock-based Compensation Table) (Details 2) - Continuing Operations - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based compensation cost, allocation of recognized costs      
Pre-tax stock-based compensation cost $ 468 $ 512 $ 614
Income tax benefits (156) (174) (213)
Net stock-based compensation cost 312 338 402
Cost      
Stock-based compensation cost, allocation of recognized costs      
Pre-tax stock-based compensation cost 100 121 122
Selling, general and administrative expense      
Stock-based compensation cost, allocation of recognized costs      
Pre-tax stock-based compensation cost 322 350 435
Research, development and engineering      
Stock-based compensation cost, allocation of recognized costs      
Pre-tax stock-based compensation cost 51 54 $ 57
Other (income) and expense      
Stock-based compensation cost, allocation of recognized costs      
Pre-tax stock-based compensation cost (income) $ (6) $ (13)