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Capital Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Sep. 30, 2013
right
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Mar. 22, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Preferred stock, shares authorized   25,000,000 25,000,000 25,000,000  
Preferred stock, shares outstanding   0 0 0  
Common stock, shares authorized   1,500,000,000 1,500,000,000 1,500,000,000 1,500,000,000
Common stock, par value (usd per share)   $ 0.01 $ 0.01 $ 0.01 $ 0.01
Common stock shares outstanding, net of treasury stock   230,100,000 239,500,000    
Treasury stock, shares   14,100,000 365,800,000   14,400,000
Repurchased shares   19,500,000 57,600,000 76,100,000  
Average cost of repurchased shares (usd per share)   $ 33.93 $ 21.51 $ 20.85  
Repurchased shares, value   $ 663.7 $ 1,240.3 $ 1,588.2  
Repurchased stock retired   371,600,000      
Period of stockholder rights plan 1 year        
Preferred stock purchase right distributed for each share of common stock 1        
Redemption price per share $ 0.01        
Ceiling of common stock ownership percentage for redemption of preferred stock rights, person or group 10.00%        
Ceiling of common stock ownership percentage for redemption of preferred stock rights, passive institutional investor 15.00%        
Total intrinsic value of stock options exercised   47.0 0.7 9.7  
Stock Options [Member] | Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   4 years      
Stock Options [Member] | Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   5 years      
Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member] | Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based payment award contractual term   6 years      
Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member] | Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based payment award contractual term   10 years      
Stock Options [Member] | 2007 Equity and Incentive Award Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards available for grant (in shares)   7,600,000      
Stock Options [Member] | 2011 Equity and Incentive Award Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards available for grant (in shares)   8,700,000      
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awarded (in shares)   747,708 695,816 1,470,625  
Restricted stock compensation expense   15.8 13.1 10.5  
Restricted stock awarded (value)   16.4 14.2 6.6  
Unrecognized compensation costs on nonvested awards   36.2      
Nonvested awards weighted average period of recognition   2 years 8 months 23 days      
Restricted Stock [Member] | Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   3 years      
Restricted Stock [Member] | Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   5 years      
Performance Shares [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   3 years      
Award shares issued in period (in shares)   1,200,000 1,100,000    
Stock award compensation expense   14.9 9.8    
Common Stock Option Plans [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs on nonvested awards   $ 57.8      
Nonvested awards weighted average period of recognition   2 years 7 months      
Series A Junior Participating Preferred Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares called by rights 0.001        
Exercise price per share 100        
Vesting Period 1 [Member] | Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   4 years      
Vesting Period 2 [Member] | Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   5 years      
Vesting Period 3 [Member] | Stock Options [Member] | 1999 Amended and Restated Equity Participation Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of award plans   7 years