Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015	Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 6	$ 5	$ 23	$ 17	$ 33
Total current year projected employer contributions			43
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	2	1	15	10	19
Total current year projected employer contributions			28
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 4	$ 4	8	$ 7	$ 14
Total current year projected employer contributions			$ 15