EARNINGS (LOSS) PER SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ (488)	$ 61	$ 95	$ 6	$ 219	$ 37	$ (27)	$ (48)	$ (326)	$ 181	$ (3,113)
Less: Net income attributable to noncontrolling interests included in continuing operations									0	0	1
Less: Net income attributable to noncontrolling interest included in discontinued operations									11	7	11
Income (loss) from continuing operations attributable to Baxter stockholders									(326)	181	(3,114)
Income (loss) from discontinued operations, net of tax	(22)	83	(406)	33	27	2,474	(112)	93	(312)	2,482	692
Net income (loss) attributable to Baxter stockholders included in discontinued operations									(323)	2,475	681
Net income (loss) attributable to Baxter stockholders	$ (512)	$ 140	$ (314)	$ 37	$ 245	$ 2,508	$ (141)	$ 44	$ (649)	$ 2,656	$ (2,433)