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
May 31, 2012
Dec. 31, 2012
option
Dec. 31, 2011
Dec. 31, 2010
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   10 years    
Stock options vesting Period   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)   $ 35 $ 40 $ 20
Excess tax benefit / (deficiency) associated with share-based plans   14 5 10
Total unrecognized compensation expense (net of estimated forfeitures)   $ 39    
Weighted-average maximum period of recognition of total unrecognized compensation expense related to nonvested awards   2 years    
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 Shares | Grant prior to 2011
       
Share-based Compensation Arrangement by Share-based Payment Award        
Performance period   2 years    
Restriction period   1 year    
Performance Shares | Grant in or after 2011
       
Share-based Compensation Arrangement by Share-based Payment Award        
Performance period   3 years    
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   2 years    
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   4 years