DISCONTINUED OPERATIONS - Major Classes of Line Items in Income From Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other operating income, net	$ (42)	$ (40)
Operating income	66	58
Interest expense, net	66	64
Other (income) expense, net	6	(3)
Income (loss) from discontinued operations, net of tax	2	62
Less: Net income attributable to noncontrolling interests included in discontinued operations	0	0
Income (loss) from discontinued operations attributable to Baxter stockholders	$ 2	62
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		352
Cost of sales		206
Gross margin		146
Selling, general and administrative expenses		116
Research and development expenses		16
Goodwill impairment		0
Other operating income, net		0
Operating income		14
Interest expense, net		13
Other (income) expense, net		7
Income (loss) from discontinued operations before gain on disposition and income taxes		(6)
Gain (loss) on disposition		191
Income tax expense (benefit)		123
Income (loss) from discontinued operations, net of tax		62
Less: Net income attributable to noncontrolling interests included in discontinued operations		0
Income (loss) from discontinued operations attributable to Baxter stockholders		$ 62