PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 10	$ 18	$ 21
Interest cost	26	25	53	49
Expected return on plan assets	(41)	(53)	(80)	(102)
Amortization of actuarial loss	23	27	47	57
Amortization of prior service cost (credit)	0	0	1	1
Total net periodic benefit cost	16	9	39	26
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1	2	2
Amortization of actuarial loss	2	0	3	2
Amortization of prior service cost (credit)	0	1	0	0
Total net periodic benefit cost	$ 3	$ 2	$ 5	$ 4