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Stockholders' Equity (Common Stock Repurchase Activity) (Details) - USD ($)
shares in Millions
 12 Months Ended 37 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 02, 2016
Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items]        
Number of Shares Repurchased     11.8  
Dollar Value Repurchased     $ 1,200,000,000  
Fiscal Year Authorized - 2014, Termination Date - December 2018        
Equity, Class of Treasury Stock [Line Items]        
Dollar Value Authorized $ 1,000,000,000.0     $ 1,000,000,000
Number of Shares Repurchased 0.1 2.4    
Dollar Value Repurchased $ 5,200,000 $ 200,700,000    
Fiscal Year Authorized - 2012, Termination Date - December 2016        
Equity, Class of Treasury Stock [Line Items]        
Dollar Value Authorized $ 1,000,000,000.0      
Number of Shares Repurchased 0.0 0.3    
Dollar Value Repurchased $ 0 $ 28,800,000    
Fiscal Year Authorized - 2010, Termination Date - none        
Equity, Class of Treasury Stock [Line Items]        
Dollar Value Authorized $ 30,000,000      
Number of Shares Repurchased 0.0 0.0    
Dollar Value Repurchased $ 0 $ 0