Segment and Revenue Information - Schedule of Segment, Reconciliation of Other Items from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Share-based plans	$ (161)	$ (135)
Research and development expense, net	(903)	(844)
Unallocated items, eliminations and other
Segment Reporting Information [Line Items]
Share-based plans	(55)	(30)
Deferred compensation	17	5
Amortization of previously capitalized interest	(22)	(21)
Research and development expense, net	(104)	(82)
Eliminations and other unallocated items	(184)	(234)
Unallocated items, eliminations and other	$ (348)	$ (362)