Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 352		$ 352		$ 328
Accrued interest and penalties	$ 48		$ 48		$ 44
Effective income tax rate reconciliation, percent	4.10%	8.20%	10.60%	13.40%
Special charges, acquisition-related costs, adjustments to contingent consideration liabilities and discrete tax items	13.20%	10.10%	6.50%	5.90%