EARNINGS (LOSS) PER SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ (900)	$ (326)	$ 181
Less: Net income attributable to noncontrolling interests included in continuing operations	0	0	0
Less: Net income attributable to noncontrolling interest included in discontinued operations	0	11	7
Income (loss) from continuing operations attributable to Baxter stockholders	(900)	(326)	181
Income (loss) from discontinued operations, net of tax	(57)	(312)	2,482
Net income (loss) attributable to Baxter stockholders included in discontinued operations	(57)	(323)	2,475
Net income (loss) attributable to Baxter stockholders	$ (957)	$ (649)	$ 2,656