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Preferred Stock (Narrative) (Details) - shares
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Preferred Stock [Line Items]        
Convertible Preferred Stock, Shares Issued upon Conversion   550,102    
Common Stock, Shares, Issued 1,380,000,000 1,391,000,000    
Preferred Stock        
Preferred Stock [Line Items]        
Preferred Stock, Shares Issued 0 0 0 800,000
Preferred shares, outstanding   0