POSTRETIREMENT BENEFIT PLANS - Components of Expense (Income) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Non-operating		$ (406)	$ (382)	$ (5)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net periodic expense (income)				73
International Plans
Defined Benefit Plan Disclosure [Line Items]
Net periodic expense (income)				11
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Curtailment loss (gain)			17
Settlement loss (gain)	$ 61
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost – Operating		35	35	1
Interest cost		970	1,022	11
Expected return on plan assets		(1,196)	(1,242)	(27)
Amortization of net loss (gain)		(68)	(121)	0
Amortization of prior service cost (credit)		8	4	0
Curtailment loss (gain)		0	17	0
Settlement loss (gain)		0	61	0
Special termination cost		1	0	0
Non-operating		(285)	(259)	(16)
Net periodic expense (income)		(250)	(224)	(15)
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost – Operating		20	20	18
Interest cost		141	139	6
Expected return on plan assets		(193)	(184)	0
Amortization of net loss (gain)		14	6	5
Amortization of prior service cost (credit)		(2)	(3)	(5)
Curtailment loss (gain)		0	0	0
Settlement loss (gain)		0	0	0
Special termination cost		0	0	0
Non-operating		(40)	(42)	6
Net periodic expense (income)		(20)	(22)	$ 24
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost – Operating		7	6
Interest cost		54	59
Expected return on plan assets		0	0
Amortization of net loss (gain)		(61)	(64)
Amortization of prior service cost (credit)		(87)	(87)
Curtailment loss (gain)		0	0
Settlement loss (gain)		0	0
Special termination cost		0	0
Non-operating		(94)	(92)
Net periodic expense (income)		$ (87)	$ (86)