Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014	Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 4	$ 7	$ 21	$ 44	$ 53
Total current year projected employer contributions			55
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	1	5	11	34	37
Total current year projected employer contributions			39
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 3	$ 2	10	$ 10	$ 16
Total current year projected employer contributions			$ 16