PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and OPEB prior service costs amortized out of AOCI					$ 1
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	$ 35	$ 35		$ 105	104
Interest costs	99	106		298	322
Expected return on plan assets	(132)	(151)		(397)	(421)
Amortization of prior service costs (credits)	0	1		1	2
Special termination benefits	0	13		0	18
Pension and OPEB mark-to-market adjustment			$ (59)	0	(59)
Net periodic benefit costs (credits)	2	4		7	(34)
Net periodic benefit costs (credits), net of amounts capitalized	(15)	(15)		(45)	(88)
OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	1	1		2	2
Interest costs	5	5		15	16
Expected return on plan assets	(9)	(7)		(26)	(23)
Amortization of prior service costs (credits)	0	(3)		(1)	(7)
Special termination benefits	0	5		0	7
Pension and OPEB mark-to-market adjustment				0	0
Net periodic benefit costs (credits)	(3)	1		(10)	(5)
Net periodic benefit costs (credits), net of amounts capitalized	$ (4)	$ 1		$ (11)	$ (6)