Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 40,170	$ 40,094
Accumulated Amortization	(13,867)	(13,358)
Indefinite-Lived: Trademarks and Other	8,657	8,663
Total Intangible Assets Gross Excluding Goodwill	48,827	48,757
Collaboration assets
Finite-Lived Intangible Assets [Line Items]
Gross Amount	5,879	5,810
Accumulated Amortization	(1,747)	(1,688)
Exclusivity assets
Finite-Lived Intangible Assets [Line Items]
Gross Amount	3,516	3,460
Accumulated Amortization	(356)	(352)
Developed technology and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,211	1,219
Accumulated Amortization	(649)	(635)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	29,564	29,605
Accumulated Amortization	$ (11,115)	$ (10,683)