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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reconciliation of Basic Shares to Diluted Shares
Basic (in shares)	510	507	509	506
Effect of dilutive securities (in shares)	2	2	2	0
Diluted (in shares)	512	509	511	506
Income (loss) from continuing operations	$ 61	$ 37	$ 162	$ (38)
Net income attributable to noncontrolling interests included in continuing operations	0	0	0	0
Income (loss) from continuing operations	61	37	162	(38)
Income (loss) from discontinued operations, net of tax	83	2,474	(290)	2,455
Net income attributable to noncontrolling interests included in discontinued operations	4	3	9	6
Income (loss) from discontinued operations attributable to Baxter stockholders	79	2,471	(299)	2,449
Net income (loss) attributable to Baxter stockholders	$ 140	$ 2,508	$ (137)	$ 2,411