Income Taxes - Unrecognized tax benefits rollforward and various tax information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Unrecognized tax benefits, excluding accrued interest, related to unrecognized tax benefits
Balance at beginning of year	$ 401	$ 385	$ 284
Additions for tax positions related to current year	12	12	10
Additions for tax positions of prior years		6
Additions for acquisitions		1	100
Reductions for settlements and expiration of statute of limitations	(219)	(2)	(3)
Reductions for tax positions of prior years	(8)	(1)	(6)
Balance at end of year	186	401	385
Recognized net tax-related interest expense	5	7	$ 6
Net accrued interest expense	$ 5	$ 139