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Common Stock - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 21, 2012
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of common stock, authorized   1,000,000,000 1,000,000,000 1,000,000,000  
Number of preferred stock, authorized   10,000,000 10,000,000    
Common stock, par value   $ 0.01 $ 0.01 $ 0.01  
Preferred stock, par value   $ 0.01 $ 0.01    
Preferred stock, shares issued   0 0    
Preferred stock, shares outstanding   0 0    
Aggregated Cash Dividends Paid     $ (209,000,000) $ (191,000,000) $ (172,000,000)
Earlier authorized shares under stock based compensation     25,500,000    
Duration of performance-based restricted stock awards, vested P36M   Option plan generally vest over a three-year period starting one year from the date of grant and expire ten years from the date of grant    
Remaining shares available for future grants under the Plan   3,500,000 3,500,000    
Stock option, Minimum Range   $ 9.14      
Stock option, Maximum Range   $ 84.58      
Weighted-average fair value of options granted     $ 30.01 $ 29.52 $ 16.73
Total intrinsic value of options exercised     120,000,000 102,000,000  
Total unrecognized compensation cost related to nonvested stock options   78,000,000 78,000,000    
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's     2 years    
Total fair value of stock options vested     55,000,000 54,000,000 78,000,000
Cash received from option exercises     113,000,000 96,000,000 73,000,000
Tax benefit realized for the tax deductions from option exercises     42,000,000 43,000,000 16,000,000
Granted shares of restricted stock and stock units 464,270   482,428 374,425 558,531
Performance based restricted stock awards     148,550    
Weighted-average grant day fair value of RSA's granted     $ 83.79 $ 79.53 $ 43.99
Total number of restricted stock awards and restricted stock units granted     406,844 496,642 921,454
Restricted stock awards [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Duration of performance-based restricted stock awards, vested     Equal thirds over three years on the anniversary of the grant date    
Total unrecognized compensation cost related to nonvested stock options   $ 37,000,000 $ 37,000,000    
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's     2 years    
Granted shares of restricted stock and stock units     482,428    
Percentage of performance based restricted stock award vesting 100.00%        
Weighted-average grant day fair value of RSA's granted     $ 83.79 $ 79.53 $ 43.99
Total number of restricted stock awards and restricted stock units granted     406,844 496,642 921,454
Non-employee [Member] | Restricted stock awards [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted shares of restricted stock and stock units     18,158