EMPLOYEE BENEFIT PLANS - Balance Sheet Position (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position
Noncurrent liabilities	$ (3,601)	$ (3,707)
Pension Benefits
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position
Prepaid pension assets	22	27
Current liabilities	(9)	(9)
Noncurrent liabilities	(158)	(108)
Funded status at end of period	(145)	(90)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax
Net actuarial (loss)/gain	(6,474)	(6,444)
Prior service credit	0	0
Total accumulated other comprehensive loss, pre-tax	(6,474)	(6,444)
Other Postretirement and Postemployment Benefits
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position
Prepaid pension assets	0	0
Current liabilities	(404)	(369)
Noncurrent liabilities	(3,066)	(3,224)
Funded status at end of period	(3,470)	(3,593)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax
Net actuarial (loss)/gain	(162)	(155)
Prior service credit	1	18
Total accumulated other comprehensive loss, pre-tax	$ (161)	$ (137)