Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Income (loss) from continuing operations	$ (51)	$ 61	$ 135	$ 162
Other comprehensive income (loss) from continuing operations, net of tax:
Currency translation adjustments, net of tax expense (benefit) of ($1) and $(19) for the three months ended September 30, 2025 and 2024, respectively, and ($13) and ($3) for nine months ended September 30, 2025 and 2024, respectively.	13	106	148	(61)
Pension and other postretirement benefits, net of tax expense (benefit) of zero and ($2) for the three months ended September 30, 2025 and 2024, respectively, and ($7) and zero for nine months ended September 30, 2025 and 2024, respectively.	(1)	(6)	5	(2)
Hedging activities, net of tax expense (benefit) of zero and ($3) for the three months ended September 30, 2025 and 2024, respectively, and ($1) and zero for nine months ended September 30, 2025 and 2024, respectively.	1	(9)	(2)	2
Total other comprehensive income (loss) from continuing operations, net of tax	13	91	151	(61)
Comprehensive income (loss) from continuing operations	(38)	152	286	101
Income (loss) from discontinued operations, net of tax	5	83	36	(290)
Currency translation adjustments, net of tax expense (benefit) of zero and $(11) for the three months ended September 30, 2025 and 2024, respectively, and zero and $(15) for nine months ended September 30, 2025 and 2024, respectively.	0	90	137	(35)
Pension and other postretirement benefits, net of tax expense (benefit) of zero for the three months ended September 30, 2025 and 2024, and $(3) and zero for nine months ended September 30, 2025 and 2024, respectively.	0	0	(11)	(1)
Total other comprehensive income (loss) from discontinued operations	0	90	126	(36)
Comprehensive income (loss) from discontinued operations	5	173	162	(326)
Comprehensive income (loss)	(33)	325	448	(225)
Less: Comprehensive income attributable to noncontrolling interests	0	4	0	9
Less: Other comprehensive loss attributable to noncontrolling interests	0	0	0	(4)
Comprehensive income (loss) attributable to Baxter stockholders	$ (33)	$ 321	$ 448	$ (230)