EARNINGS (LOSS) PER SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 73	$ 51	$ (193)	$ 0	$ 144	$ (2,991)	$ 185	$ 8	$ (69)	$ (2,654)	$ 1,033
Net income attributable to noncontrolling interests									7	12	11
Income (loss) from continuing operations attributable to Baxter stockholders									(76)	(2,666)	1,022
Income from discontinued operations, net of tax	173	2,460	54	45	41	57	70	65	2,732	233	262
Net income (loss) attributable to Baxter stockholders	$ 245	$ 2,508	$ (141)	$ 44	$ 181	$ (2,937)	$ 252	$ 71	$ 2,656	$ (2,433)	$ 1,284