Supplemental Financial Statement Data Allowance for doubtful accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Supplemental Financial Statement Data [Abstract]
Balance at beginning of year	$ 7	$ 5	$ 6
Additions charged to expense	4	6	2
Doubtful accounts charged to reserve	(3)	(4)	(3)
Balance at end of year	$ 8	$ 7	$ 5