DISCONTINUED OPERATIONS - Major Classes of Line Items in Income From Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating income	$ 191	$ 179	$ 249	$ 294
Interest expense, net	58	86	122	164
Other (income) expense, net	0	(24)	(3)	(33)
Income (loss) from discontinued operations, net of tax	(31)	(406)	31	(373)
Less: Net income attributable to noncontrolling interests included in discontinued operations	0	3	0	5
Income (loss) from discontinued operations attributable to Baxter stockholders	(31)	(409)	31	(378)
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0	1,118	352	2,220
Cost of sales	0	718	206	1,394
Gross margin	0	400	146	826
Selling, general and administrative expenses	0	298	116	596
Research and development expenses	0	43	16	99
Goodwill impairment	0	430	0	430
Operating income	0	(371)	14	(299)
Interest expense, net	0	(1)	13	(1)
Other (income) expense, net	0	4	7	6
Income (loss) from discontinued operations before gain on disposition and income taxes	0	(374)	(6)	(304)
Gain (loss) on disposition	(21)	0	170	0
Income tax expense (benefit)	10	32	133	69
Income (loss) from discontinued operations, net of tax	(31)	(406)	31	(373)
Less: Net income attributable to noncontrolling interests included in discontinued operations	0	3	0	5
Income (loss) from discontinued operations attributable to Baxter stockholders	$ (31)	$ (409)	$ 31	$ (378)