Condensed Consolidated Statements of Loss (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Net sales	$ 2,835	$ 2,699	$ 8,270	$ 7,883
Cost of sales	1,885	1,666	5,468	4,858
Gross margin	950	1,033	2,802	3,025
Selling, general and administrative expenses	708	754	2,129	2,206
Research and development expenses	118	129	392	379
Other operating income, net	(48)	(5)	(140)	(9)
Operating income	172	155	421	449
Interest expense, net	58	87	180	251
Other (income) expense, net	7	1	10	34
Income (loss) from continuing operations before income taxes	121	69	251	232
Income tax expense (benefit)	172	8	116	70
Income (loss) from continuing operations	(51)	61	135	162
Income (loss) from discontinued operations, net of tax	5	83	36	(290)
Net income (loss)	(46)	144	171	(128)
Less: Net income attributable to noncontrolling interests included in continuing operations	0	0	0	0
Less: Net income attributable to noncontrolling interests included in discontinued operations	0	4	0	9
Net income attributable to noncontrolling interests	0	4	0	9
Net income (loss) attributable to Baxter stockholders	$ (46)	$ 140	$ 171	$ (137)
Income (loss) from continuing operations per common share
Income from continuing operations per common share, basic (in dollars per share)	$ (0.10)	$ 0.12	$ 0.26	$ 0.32
Income from continuing operations per common share, diluted (in dollars per share)	(0.10)	0.12	0.26	0.32
Income (loss) from discontinued operations per common share
Income from discontinued operations per common share, basic (in dollars per share)	0.01	0.15	0.07	(0.59)
Income from discontinued operations per common share, diluted (in dollars per share)	0.01	0.15	0.07	(0.59)
Income (loss) per common share
Basic (in dollars per share)	(0.09)	0.27	0.33	(0.27)
Diluted (in dollars per share)	$ (0.09)	$ 0.27	$ 0.33	$ (0.27)
Weighted-average number of shares outstanding
Basic (in shares)	514	510	513	509
Diluted (in shares)	514	512	514	511