PENSION AND OTHER POSTRETIREMENT BENEFITS - Pre-tax Amounts Recorded in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jan. 01, 2021
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 136	$ 1,187
Net prior service (credit) cost	(212)	(246)
Defined benefit plan, accumulated comprehensive income (loss)	(76)	941
Pension
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	209	1,215
Net prior service (credit) cost	(218)	(253)
Defined benefit plan, accumulated comprehensive income (loss)	(9)	962
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(73)	(28)
Net prior service (credit) cost	6	7
Defined benefit plan, accumulated comprehensive income (loss)	$ (67)	$ (21)