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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Changes in Fair Value Measurements that Used Significant Unobservable Inputs (Details) - Other holdings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of period	$ 115
End of period	152	$ 115
Significant unobservable inputs (Level 3)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of period	11	10
Sales	(2)	(1)
End of period	$ 9	$ 11

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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