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Common Stock (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Feb. 28, 2011
Dec. 31, 2011
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Restricted stock [Member]
Y
Dec. 31, 2010
Restricted stock [Member]
Dec. 31, 2009
Restricted stock [Member]
Dec. 31, 2011
Restricted stock [Member]
Non Employee [Member]
Feb. 16, 2010
Performance-base restricted stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Stock options granted, weighted average exercise price   $ 79.68 $ 79.68 $ 44.03 $ 26.03 $ 0.00        
Percentage of performance based restricted stock award vesting 100.00%                  
Duration of performance-based restricted stock awards, vested P36M   Option generally vest over a three-year period starting one year from the date of grant and expire ten years from the date of grant     equal thirds over three years on the anniversary of the grant date        
Total number of restricted stock awards and restricted stock units granted 234,620   496,642 921,454 7,322 496,642 921,454 7,322 8,505  
Restricted stock granted, shares     374,425 558,531 762,692         131,300
Weighted-average grant day fair value of RSA's granted     $ 79.53 $ 43.99 $ 26.02 $ 79.53 $ 43.99 $ 26.02    
Total unrecognized compensation cost related to nonvested stock options   $ 68 $ 68     $ 30        
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's     2     2        
Common Stock (Textual) [Abstract]                    
Number of common stock, authorized   1,000,000,000 1,000,000,000              
Common stock, par value   $ 0.01 $ 0.01 $ 0.01            
Common stock, shares issued   423,900,601 423,900,601 421,141,751            
Common stock, shares outstanding   423,900,601 423,900,601 421,141,751            
Number of preferred stock, authorized   10,000,000 10,000,000              
Preferred stock, par value   $ 0.01 $ 0.01              
Preferred stock, shares issued   0 0              
Preferred stock, shares outstanding   0 0              
Aggregated Cash Dividends Paid     191 172 460          
Earlier authorized shares under stock based compensation     25,500,000              
Remaining shares available for future grants under the Plan   6,000,000 6,000,000              
Stock option, Minimum Range   $ 8.38                
Stock option, Maximum Range   $ 79.80                
Weighted-average fair value of options granted     $ 29.52 $ 16.73 $ 11.89          
Total intrinsic value of options exercised     102 60            
Total fair value of stock options vested     54 78 40          
Cash received from option exercises     96 73 8          
Tax benefit realized for the tax deductions from option exercises     $ 43 $ 16 $ 2