EARNINGS PER SHARE - Reconciliation of Basic Shares to Diluted Shares (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reconciliation of Basic Shares to Diluted Shares
Basic shares (in shares)	514	510	513	509
Effect of dilutive securities (in shares)	0	2	1	2
Diluted (in shares)	514	512	514	511
Income (loss) from continuing operations	$ (51)	$ 61	$ 135	$ 162
Less: Net income attributable to noncontrolling interests included in continuing operations	0	0	0	0
Income (loss) from continuing operations	(51)	61	135	162
Income (loss) from discontinued operations, net of tax	5	83	36	(290)
Less: Net income attributable to noncontrolling interests included in discontinued operations	0	4	0	9
Income (loss) from discontinued operations attributable to Baxter stockholders	5	79	36	(299)
Net income (loss) attributable to Baxter stockholders	$ (46)	$ 140	$ 171	$ (137)