RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Net periodic benefit costs:
Service cost — benefits earned during the period	$ 8	$ 37	$ 47
Interest cost on projected benefit obligation	35	52	40
Expected return on plan assets	(59)	(73)	(52)
Recognized actuarial loss	2	5	9
Recognized prior service credit	0	0	0
(Gain) loss due to curtailment	0	(124)	(91)
Gain due to settlement	(19)	(19)	0
Special termination benefits	0	22	49
Other costs and adjustments	0	1	(2)
Net periodic benefit cost	(33)	(99)	0
Postretirement Benefits
Net periodic benefit costs:
Service cost — benefits earned during the period	42	39	24
Interest cost on projected benefit obligation	33	37	36
Expected return on plan assets	0	0	0
Recognized actuarial loss	15	11	8
Recognized prior service credit	(9)	(8)	(8)
(Gain) loss due to curtailment	0	2	6
Gain due to settlement	0	0	0
Special termination benefits	0	0	0
Other costs and adjustments	0	0	0
Net periodic benefit cost	$ 81	$ 81	$ 66