PENSION AND OTHER POSTRETIREMENT BENEFITS - Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Millions	Jan. 01, 2021	Jan. 03, 2020
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10,469	$ 9,656
Accumulated benefit obligation	8,658	7,931
Projected benefit obligation	10,522	9,700
Fair value of plan assets	8,689	7,959
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	181	322
Fair value of plan assets	$ 85	$ 224