PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 7		$ 8	$ 21	$ 24
Interest cost	54		59	163	176
Expected return on plan assets	(80)		(79)	(240)	(236)
Prior service credits	5		5	13	13
Net actuarial loss (gain)	0		0	0	2
Net periodic benefit costs (credits)	(14)		(7)	(43)	(21)
Defined benefit pension contributions	75		0	91	0
Defined benefit plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	2		2	6	7
Interest cost	13		15	38	47
Expected return on plan assets	(11)		(10)	(32)	(31)
Termination benefits	0	$ 2	0	2	0
Prior service credits	(4)		(4)	(12)	(12)
Net actuarial loss (gain)	(39)		(36)	(116)	(109)
Net periodic benefit costs (credits)	(39)		(33)	(114)	(98)
OPEB contributions	$ 0		$ 0	$ 0	$ 0