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Stock Based Compensation (Details 4) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Restricted Stock Activity [Member]
Dec. 31, 2011
Restricted Stock Activity [Member]
Dec. 31, 2010
Restricted Stock Activity [Member]
Dec. 31, 2012
Special Dividend Adjustment [Member]
Restricted stock and unit activity              
Nonvested shares, Beginning Balance       4.4      
Shares, Granted       1.7 [1]     0.2
Shares, Vested       (2.5)      
Shares, Forfeited       (0.2)      
Nonvested shares, Ending Balance       3.4 4.4    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]              
Weighted-average grant-date fair value, Beginning balance       $ 36.78      
Weighted-average grant-date fair value, Granted       $ 44.38 [1]      
Weighted-average grant-date fair value, Vested       $ 35.24      
Weighted-average grant-date fair value, Forfeited       $ 37.54      
Weighted-average grant-date fair value, Ending balance       $ 40.49 $ 36.78    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]              
Total fair value of restricted stock and unit awards vested       $ 115      
Weighted-average years to be recognized over       1 year 8 months 12 days      
Weighted-average grant-date fair value, Granted       $ 44.38 $ 37.80 $ 33.72  
Total fair value of restricted stock and unit awards vested       90 1 1  
Tax benefit relating to restricted stock activity $ 36 $ 29 $ 20 $ 32 $ 22 $ 13  
[1] There are 0.2 million shares within the total amount granted during the year that relate to the adjustment in connection with the special dividend announced in the fourth quarter of 2012.