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Preferred Stock (Narrative) (Details) - USD ($)
$ in Millions
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Preferred Stock [Line Items]        
Convertible Preferred Stock, Shares Issued upon Conversion   550,102    
Common Stock, Shares, Issued 1,409,000,000 1,420,000,000    
Preferred Stock        
Preferred Stock [Line Items]        
Preferred stock, authorized (in shares)     3,000,000  
Preferred Stock, Shares Issued 0 0 803,953 800,000
Outstanding preferred shares, fair value     $ 68  
Preferred shares, outstanding   0 114,753