Preferred Stock (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Preferred Stock [Line Items]
Common Stock, Shares, Issued		1,420,000,000	1,428,000,000
Preferred Stock
Preferred Stock [Line Items]
Preferred stock, authorized (in shares)		3,000,000	3,000,000
Preferred Stock, Shares Issued		803,953	803,953	800,000
Outstanding preferred shares, fair value		$ 68	$ 64
Preferred shares, outstanding		114,753	122,553
Subsequent Event [Member]
Preferred Stock [Line Items]
Common Stock, Shares, Issued	550,102