Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Additional Information (Detail)

v2.4.0.6
STOCK-BASED COMPENSATION - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting (exercisable) period of awards 5 years    
Incentive Compensation Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares reserved for issuance under the Incentive Compensation Plan 80,000,000    
Shares available to be issued under the Incentive Compensation Plan 39,000,000    
Incentive Compensation Plan | Stock Option Program and Stock Appreciation Right Program
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Reduction in the share reserve by each share issued pursuant to an option and each share issued subject to the exercised portion of a stock appreciation right 1    
Incentive Compensation Plan | Restricted Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Reduction in the share reserve by each share issued pursuant to an option and each share issued subject to the exercised portion of a stock appreciation right 2.76    
Management Incentive Award
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting (exercisable) period of awards 5 years    
Percentage of the award vesting at each anniversary date of the grant 20.00%    
Long Term Incentive Performance Award
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting (exercisable) period of awards 3 years    
Long Term Incentive Performance Award | Restricted Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value of Stock Units granted $ 69.53 $ 66.36 $ 56.33
Total fair value of Stock Units vested $ 557 $ 523 $ 318
Total unrecognized compensation cost related to nonvested Stock 577    
Recognition period for the compensation cost 2 years 6 months    
Nonqualified Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting (exercisable) period of awards 5 years    
Percentage of the award vesting at each anniversary date of the grant 20.00%    
Total intrinsic value of options exercised 31 18 5
Total unrecognized compensation cost related to nonvested Stock 4    
Recognition period for the compensation cost 1 year 11 months    
Cash received from option holders from the exercise of stock options 92 60 27
Tax benefit from the exercise of stock options $ 6 $ 4 $ 1
Discounted Employee Stock Purchase Modified Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of closing price of class B stock at which class A stock can be purchased     95.00%
Discounted Employee Stock Purchase Prior Modified Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of closing price of class B stock at which class A stock can be purchased     90.00%
Discounted Employee Stock Purchase Plan
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee purchase of shares under discounted employee stock purchase plan, number of shares 1,300,000 1,500,000 600,000
Employee purchase of shares under discounted employee stock purchase plan, average prices $ 66.86 $ 57.98 $ 44.30
Weighted average fair value of the employee purchase rights     $ 7.52