Preferred Stock (Narrative) (Details) - USD ($) $ in Millions	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
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	803,953	800,000	800,000
Outstanding preferred shares, fair value		$ 68
Preferred shares, outstanding		114,753