PENSION AND OTHER POSTRETIREMENT BENEFITS - Pre-tax Amounts Recorded in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Jan. 01, 2021	Jan. 03, 2020
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 1,187	$ 785
Net prior service (credit) cost	(246)	(283)
Defined benefit plan, accumulated comprehensive income (loss)	941	502
Pension
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	1,215	819
Net prior service (credit) cost	(253)	(282)
Defined benefit plan, accumulated comprehensive income (loss)	962	537
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(28)	(34)
Net prior service (credit) cost	7	(1)
Defined benefit plan, accumulated comprehensive income (loss)	$ (21)	$ (35)

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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