RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disposed of by sale | OxyChem
Net periodic benefit costs:
Net periodic benefit costs	$ 9	$ 1	$ 2
Pension Benefits
Net periodic benefit costs:
Service cost — benefits earned during the period	4	4	5
Interest cost on projected benefit obligation	42	42	45
Expected return on plan assets	(36)	(41)	(45)
Recognized actuarial loss (gain)	3	2	4
Recognized prior service credit	0	0	0
Gain (loss) due to settlement	0	0	1
Net periodic benefit costs	13	7	10
Postretirement Benefits
Net periodic benefit costs:
Service cost — benefits earned during the period	20	18	16
Interest cost on projected benefit obligation	42	35	37
Expected return on plan assets	0	0	0
Recognized actuarial loss (gain)	(11)	(15)	(20)
Recognized prior service credit	(8)	(8)	(9)
Gain (loss) due to settlement	0	0	0
Net periodic benefit costs	$ 43	$ 30	$ 24