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Stockholders' Equity (Common Stock Repurchase Programs) (Details) - USD ($)
shares in Millions
 12 Months Ended 61 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Common Stock Repurchase Programs      
Number of shares repurchased (in shares)     11.8
Authorizations remaining $ 824,200,000    
2012 Authorization      
Common Stock Repurchase Programs      
Common stock authorized amount 1,000,000,000.0    
2014 Authorization      
Common Stock Repurchase Programs      
Common stock authorized amount 1,000,000,000.0    
Common stock repurchased $ 0 $ 5,200,000  
Number of shares repurchased (in shares) 0.0 0.1  
Twenty Twelve and Twenty Fourteen Authorization [Member]      
Common Stock Repurchase Programs      
Common stock repurchased     $ 1,200,000,000
Repurchase program authorized in 2010      
Common Stock Repurchase Programs      
Common stock authorized amount $ 30,000,000    
Common stock repurchased $ 0 $ 0  
Number of shares repurchased (in shares) 0.0 0.0