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Stock-Based Compensation (Narratives) (Details 1) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2011
Employee
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award        
Shares authorized under existing stock based compensation plans (in shares)   274,100,000    
Additional shares considered authorized under previous stock based compensation plans (in shares)   66,200,000    
Unused shares available for purchase (in shares)   118,600,000    
Stock-based compensation cost, unrecognized, related to non-vested awards   $ 995,000,000 $ 1,101,000,000  
Capitalized stock-based compensation cost   0 0 0
Income tax benefits   (213,000,000) (240,000,000) (246,000,000)
Additional options outstanding in connection with acquisitions (in shares)   600,000    
Additional options outstanding, weighted-average exercise price (in dollars per share)   $ 67    
Treasury stock, Shares (in shares)   1,153,131,611 1,080,193,483  
Stock-based compensation cost, unrecognized, related to non-vested awards, weighted average period of recognition   3 years    
Employee Stock Purchase Plan
       
Share-based Compensation Arrangement by Share-based Payment Award        
Unused shares available for purchase (in shares)   2,300,000 3,800,000 5,400,000
Discount on purchase of common stock (as a percent)   5.00%    
Maximum percentage of payroll deductions on eligible compensation (as a percent)   10.00%    
Maximum stock purchases by employees, value   25,000    
Maximum stock purchases by employees (in shares)   1,000    
Employees purchased shares under the ESPP (in shares)   1,500,000 1,600,000 1,900,000
Stock options
       
Share-based Compensation Arrangement by Share-based Payment Award        
Percentage of awards vested per year (as a percent)   25.00%    
Vesting period   4 years    
Contractual term   10 years    
Total intrinsic value of options exercised   614,000,000 1,005,000,000 1,269,000,000
Cash received from exercises of stock options   505,000,000 785,000,000 1,786,000,000
Tax benefit from exercise of stock options   199,000,000 341,000,000 412,000,000
Treasury stock, Shares (in shares)   1,153,000,000 1,080,000,000  
Restricted Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award        
Fair value of stock units granted   481,000,000 486,000,000 803,000,000
Fair value of stock units vested and released   386,000,000 509,000,000 373,000,000
Stock-based compensation cost, unrecognized, related to non-vested awards   871,000,000 938,000,000 1,021,000,000
Fair value of stock units granted per non-executive employee, second quarter 2011 1,000      
Number of non-executive employees to receive equity award grant, second quarter 2011 400,000      
Restricted Stock Units | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period   1 year    
Restricted Stock Units | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period   5 years    
Performance Share Units
       
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period   3 years    
Fair value of stock units granted   170,000,000 186,000,000 165,000,000
Fair value of stock units vested and released   156,000,000 203,000,000 141,000,000
RSUs and PSUs
       
Share-based Compensation Arrangement by Share-based Payment Award        
Income tax benefits   $ 312,000,000 $ 454,000,000 $ 283,000,000