Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	$ 96	$ 72	$ 238	$ 124
Employer contributions to employee benefit plans	4	6	28	23	$ 33
Total current year projected employer contributions			42
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	2	2	23	15	18
Total current year projected employer contributions			26
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	2	4	5	8	$ 15
Total current year projected employer contributions			16
Employee related costs
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	25	$ 6	$ 136	$ 20
Employee related costs | Multiemployer Plans
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	$ 26
Cash Obligation Period	20 years