Postemployment Benefits Pension Plans - Plans that were Underfunded Based on Projected Benefit Obligation in Excess of Plan Assets-Projected Benefit Obligations, Accumulated Benefit Obligations, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jan. 03, 2016
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 3,669	$ 5,990
Accumulated benefit obligation	3,669	5,986
Fair value of plan assets	3,282	5,282
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	539	119
Accumulated benefit obligation	534	72
Fair value of plan assets	$ 445	$ 43