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Stock-Based Compensation Plans (Details Textuals) (USD $)
12 Months Ended 36 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock based compensation programs 4      
Maximum limit of total stock awards 29,000,000     29,000,000
Stock-based compensation award number of shares available for future 5,000,000     5,000,000
Tax benefit from compensation expense 22,000,000 $ 14,000,000 $ 11,000,000  
Number of types of restricted stock unit awards 2      
Total intrinsic value of options exercised 18,000,000      
Shares authorized for issuance 1,700,000     1,700,000
Number of shares available for grant 988,713     988,713
EDCP
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (income)   4,000,000 (3,000,000) 0
Deferral period 3 years      
DCPD
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (income) 4,000,000 4,000,000 4,000,000  
Net liability of stock option 6,000,000 6,000,000   6,000,000
Restricted Stock and Restricted Stock Units Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock granted 915,891      
Grant-date fair value 41,000,000      
Stock option weighted-average vesting period 3 years 0 months 11 days      
Compensation expense (income) 30,000,000 35,000,000 22,000,000  
Unrecognized cost 39,000,000     39,000,000
Unrecognized cost, period for recognition 2 years      
Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (income) 900,000 800,000 0  
Proceeds from options exercised 50,000,000 32,000,000 6,000,000  
Performance Shares
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation award vesting period   3 years    
Compensation expense (income) 3,000,000 2,000,000 (4,000,000)  
Employee Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense (income) 23,000,000 $ 21,000,000 $ 30,000,000  
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation award vesting period 2 months      
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation award vesting period 10 years