EMPLOYEE-RELATED BENEFITS - Net Periodic Pension Costs and Components Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components recognized in Other comprehensive income (loss)
Curtailment gain (loss)	$ 0	$ (13)	$ 0
Pension Benefits
Pension benefit costs (credits), net
Service cost	17	31	31
Interest cost	36	47	41
Expected return on plan assets	(61)	(66)	(68)
Amortization, net	29	22	32
Net periodic benefit cost (credit)	21	34	36
Settlement cost	92	0	0
(Gain) loss on curtailment	0	(10)	0
Restructuring (benefit) loss	0	8	0
Total benefit cost (credit)	113	32	36
Components recognized in Other comprehensive income (loss)
Net loss (gain)	60	2	42
Amortization, net	(29)	(22)	(32)
Accelerated prior service credit (cost) due to curtailment	0	12	0
Settlements	(92)	0	0
Total recognized in other comprehensive income (loss)	(61)	(8)	10
Total benefit cost (credit) and other comprehensive income (loss)	52	24	46
Other Benefits
Pension benefit costs (credits), net
Service cost	1	1	1
Interest cost	3	4	3
Expected return on plan assets	0	0	0
Amortization, net	(1)	(8)	(7)
Net periodic benefit cost (credit)	3	(3)	(3)
Settlement cost	0	0	0
(Gain) loss on curtailment	0	(18)	0
Restructuring (benefit) loss	0	0	0
Total benefit cost (credit)	3	(21)	(3)
Components recognized in Other comprehensive income (loss)
Net loss (gain)	4	8	(6)
Amortization, net	1	8	7
Accelerated prior service credit (cost) due to curtailment	0	11	0
Settlements	0	0	0
Total recognized in other comprehensive income (loss)	5	27	1
Total benefit cost (credit) and other comprehensive income (loss)	$ 8	$ 6	$ (2)