Acquisitions - Aggregate Consideration Paid (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 14,897	$ 14,890
Teneobio
Business Acquisition [Line Items]
Cash paid	993
Contingent consideration obligation for acquisition	299
Total consideration	1,292
Fair value of assets acquired, cash	100
Goodwill	273
Other assets, net	16
Deferred tax liability	(244)
Total assets acquired, net	1,292
Teneobio | R & D Technology rights
Business Acquisition [Line Items]
Fair value of assets acquired, licensing rights	115
Teneobio | Licensing rights
Business Acquisition [Line Items]
Fair value of assets acquired, licensing rights	41
Teneobio | In-process Research and Development
Business Acquisition [Line Items]
IPR&D	$ 991