EARNINGS PER SHARE - Reconciliation of Basic Shares to Diluted Shares (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reconciliation of Basic Shares to Diluted Shares
Basic shares (in shares)	515	512
Effect of dilutive securities (in shares)	0	2
Diluted (in shares)	515	514
Income (loss) from continuing operations	$ (17)	$ 64
Less: Net income attributable to noncontrolling interests included in continuing operations	0	0
Income (loss) from continuing operations	(17)	64
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
Net income (loss) attributable to Baxter stockholders	$ (15)	$ 126