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PENSION AND OTHER POSTRETIREMENT BENEFITS - Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Jan. 01, 2021
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 9,216 $ 10,469
Accumulated benefit obligation 8,672 8,658
Projected benefit obligation 9,340 10,522
Fair value of plan assets 8,786 8,689
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 109 181
Fair value of plan assets $ 30 $ 85