PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 11
Interest cost	27	24
Expected return on plan assets	(39)	(49)
Amortization of actuarial loss	24	30
Amortization of prior service cost (credit)	1	1
Total net periodic benefit cost	23	17
Other Post-Employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Amortization of actuarial loss	1	2
Amortization of prior service cost (credit)	0	(1)
Total net periodic benefit cost	$ 2	$ 2