Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Apr. 02, 2016	Apr. 04, 2015	Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 17	$ 12	$ 33
Total current year projected employer contributions	43
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	13	9	19
Total current year projected employer contributions	28
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	4	$ 3	$ 14
Total current year projected employer contributions	$ 15