ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Amounts Reclassification from AOCI to Net Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	$ 20	$ (42)	$ 27	$ (40)
Income tax expense	(54)	(10)	(131)	(24)
Cost of sales	(2,381)	(2,596)	(4,586)	(4,834)
Interest expense, net	(85)	(124)	(163)	(241)
Loss from continuing operations before income taxes	(257)	(183)	(141)	(169)
Net loss attributable to Baxter stockholders	(314)	(141)	(277)	(97)
Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss attributable to Baxter stockholders	1	5	0	10
Amounts reclassified from AOCI | Pension and OPEB items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	1	5	3	10
Income tax expense	0	(1)	(1)	(3)
Net loss attributable to Baxter stockholders	1	4	2	7
Amounts reclassified from AOCI | Gains (losses) on hedging activities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	1	0	1	(1)
Loss from continuing operations before income taxes	(1)	1	(3)	4
Net loss attributable to Baxter stockholders	0	1	(2)	3
Amounts reclassified from AOCI | Gains (losses) on hedging activities | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	3	3	5	7
Amounts reclassified from AOCI | Gains (losses) on hedging activities | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	(2)	$ (2)	(3)	$ (3)
Amounts reclassified from AOCI | Gains (losses) on hedging activities | Fair value hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	$ (2)		$ (5)