Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Apr. 01, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	$ 1		$ 40	$ 239	$ 164
Employer contributions to employee benefit plans	5		6	33	29	$ 33
Total current year projected employer contributions				42
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	2		3	25	18	18
Total current year projected employer contributions				26
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	3		3	8	11	$ 15
Total current year projected employer contributions				16
Employee related costs
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	$ 31		$ 6	$ 166	$ 26
Employee related costs | Multiemployer Plans
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges		$ 26
Cash Obligation Period		20 years