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Stock Based Compensation (DetailsTextual) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nov. 08, 2010
Aug. 19, 2010
Jul. 13, 2011
Chairman and Founder [Member]
Jun. 22, 2011
Chairman and Founder [Member]
Dec. 31, 2011
Stock option plan 2009 [Member]
Dec. 31, 2010
Stock option plan 2009 [Member]
Dec. 31, 2010
Stock option plan 1987 [Member]
Aug. 31, 2009
Stock Appreciation Rights (SARs) [Member]
Sep. 01, 2009
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2010
1987 Stock Option Plan granted prior to December 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Maximum number of shares, issued under the option plan               16,000,000          
Number of shares available to be granted               9,770,666 9,659,000        
Period of granted option               7 years   7 years     10 Years
Exercised number of shares, under stock option plan           200,001 1,083,333            
Cash payments made on cashless exercise of stock options           $ 5 $ 25            
Tax benefit of cashless exercise of stock options           2 4            
Cashless exercise of stock option charged to contributed surplus           1 7            
Cashless exercise of stock option charged to retained earnings           2 14            
Option vested under stock option plan to employees and consultants               one-third on each of the first three anniversaries of the date of grant          
Previously granted and unexercised stock option                     383,400    
Number of stock appreciation rights exercised                     332,822    
Number of option cancelled                       50,578  
Holding period of restricted stock available to executive 4 years                        
Share based compensation arrangement long-term retention program restricted stock available to executive releasing period 10 years                        
Number of days considered for weighted average trading price 20 days                        
Stock based compensation (Textual) [Abstract]                          
Vesting stock option 33.00%                        
Vesting stock option 34.00%                        
Total intrinsic value of options exercised 19 14 0                    
Cash payment to executives for exercise of SARs     1                    
Stock option shares surrendered       386,666 243,000                
In-the-money value of surrendered stock options       8 4                
One time compensation expense $ 20                        
Percentage of annual retainers 0.00%                        
Percentage of additional annual retainers 100.00%                        
Percentage of increments 25.00%