RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure
Accrued liabilities for the supplemental retirement plan	$ 451	$ 387
Expenses under provisions of defined contribution and supplemental retirement plans	274	252	$ 221
Total benefit costs, including postretirement costs	240	205	175
Pension Benefits
Defined Benefit Plan Disclosure
Net periodic benefit costs	13	7	10
Expected contribution to defined benefit pension plans in next fiscal year	33
Postretirement Benefits
Defined Benefit Plan Disclosure
Net periodic benefit costs	$ 43	30	24
Postretirement Benefits | MAPD
Defined Benefit Plan Disclosure
Projected annual rates of healthcare cost trend rates, current year (as a percent)	44.00%
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent)	45.00%
Projected annual rates of healthcare cost trend rates, year two (as a percent)	10.00%
Defined benefit plan, health care cost trend rate assumed, year three	6.50%
Defined benefit plan, health care cost trend rate assumed, year eleven and thereafter	4.50%
Postretirement Benefits | Non-MAPD
Defined Benefit Plan Disclosure
Projected annual rates of healthcare cost trend rates, current year (as a percent)	6.20%
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent)	7.00%
Defined benefit plan, health care cost trend rate assumed, year eleven and thereafter	4.50%
Disposed of by sale | OxyChem
Defined Benefit Plan Disclosure
Net periodic benefit costs	$ 9	$ 1	$ 2