POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Non-operating	$ (115)	$ (2)
Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Service cost – Operating	14	5
Interest cost	292	4
Expected return on plan assets	(356)	(7)
Amortization of net loss (gain)	(29)	2
Amortization of prior service cost (credit)	(1)	(1)
Non-operating	(94)	(2)
Net periodic (income) expense	(80)	3
Other postretirement plans
Defined Benefit Plan Disclosure [Line Items]
Service cost – Operating	2	0
Interest cost	15	0
Expected return on plan assets	0	0
Amortization of net loss (gain)	(16)	0
Amortization of prior service cost (credit)	(22)	0
Non-operating	(23)	0
Net periodic (income) expense	$ (21)	$ 0