Employee Benefits - Contributions to Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	$ 20	$ 142
Employer contributions to employee benefit plans	19	24	$ 44
Total current year projected employer contributions	37
Pension
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	15	21	31
Total current year projected employer contributions	24
Nonpension postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	4	3	$ 13
Total current year projected employer contributions	13
Employee related costs
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges	$ 4	107
Employee related costs | Multiemployer Plans
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges		$ 26
Cash Obligation Period		20 years