Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE AND STOCK OPTION PLANS (Details)

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STOCK INCENTIVE AND STOCK OPTION PLANS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Jan. 31, 2010
Dec. 31, 2011
option
Y
Dec. 31, 2010
Dec. 31, 2009
STOCK INCENTIVE AND STOCK OPTION PLANS        
Number of stock-based awards authorized to be granted to executives and employees under the 2003 stock incentive plan, as amended (in shares) 13,500,000      
Stock-based awards in the form of stock options to be granted to executives and employees under the 2003 stock incentive plan, as amended (as a percent) 50.00%      
Stock options' expiration from the date of grant (in years)   10    
Stock options vesting Period (in years)   2 years    
Stock options granted for every even block of 100 KESIP shares purchased by the employee   50    
Number of shares in every even block of KESIP shares   100    
Compensation expense (net of estimated forfeitures)   $ 40 $ 20 $ 20
Excess tax benefit / (deficiency) associated with share-based plans   5 10 (1)
Total unrecognized compensation expense (net of estimated forfeitures)   $ 39    
Weighted-average maximum period of recognition of total unrecognized compensation expense related to nonvested awards (in years)   2    
Performance Shares | Minimum
        
Share-based Compensation Arrangement by Share-based Payment Award        
Target award based on the actual ROE performance (as a percent)   0.00%    
Performance Shares | Maximum
        
Share-based Compensation Arrangement by Share-based Payment Award        
Target award based on the actual ROE performance (as a percent)   200.00%    
Performance share grants prior to 2011
        
Share-based Compensation Arrangement by Share-based Payment Award        
Performance period (in years)   2    
Period of restriction on shares earned that is based on ROE performance (in years)   1    
Performance share grants in 2011
        
Share-based Compensation Arrangement by Share-based Payment Award        
Performance period (in years)   3    
Restricted Shares
        
Share-based Compensation Arrangement by Share-based Payment Award        
Restricted shares released after two years (as a percent)   33.00%    
Period after which portion of issued restricted shares will be released (in years)   2    
Restricted shares released on the grant date each year after the first two years (as a percent)   33.00%    
Restriction period to recognize compensation expense (in years)   4