POSTRETIREMENT BENEFIT PLANS - Schedule of Defined Benefit Plans (Details) $ in Millions	Jan. 01, 2023 USD ($)
Accumulated Benefit Obligations and Unrecognized Gain
Accumulated benefit obligations	$ 22,906
Unrecognized gain to be recorded in AOCI	2,481
Net Benefit Liability
Projected benefit obligations	22,953
Fair value of assets	18,908
Net liability	4,045
Defined benefit plans
Accumulated Benefit Obligations and Unrecognized Gain
Accumulated benefit obligations	21,696
Unrecognized gain to be recorded in AOCI	1,258
Net Benefit Liability
Projected benefit obligations	21,743
Fair value of assets	18,908
Net liability	2,835
Other postretirement plans
Accumulated Benefit Obligations and Unrecognized Gain
Accumulated benefit obligations	1,210
Unrecognized gain to be recorded in AOCI	1,223
Net Benefit Liability
Projected benefit obligations	1,210
Fair value of assets	0
Net liability	$ 1,210