ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Amounts Reclassification from AOCI to Net Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 7	$ 2
Income tax expense	(77)	(14)
Cost of sales	(2,205)	(2,238)
Income from continuing operations before income taxes	116	14
Net income attributable to Baxter stockholders	37	44
Amounts reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Baxter stockholders	(1)	5
Amounts reclassified from AOCI | Pension and OPEB items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	2	5
Income tax expense	(1)	(2)
Net income attributable to Baxter stockholders	1	3
Amounts reclassified from AOCI | Gains (losses) on hedging activities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0	(1)
Income from continuing operations before income taxes	(2)	3
Net income attributable to Baxter stockholders	(2)	2
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	2	4
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	(1)	(1)
Amounts reclassified from AOCI | Gains (losses) on hedging activities | Fair value hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ (3)	$ 0