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Goodwill and other intangible assets - (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The changes in the carrying amounts of goodwill were as follows (in millions):
December 31,
20202019
Beginning balance$14,703 $14,699 
Addition from acquisitions— 26 
Currency translation adjustments(14)(22)
Ending balance$14,689 $14,703 
Schedule of identifiable intangible assets
Other intangible assets consisted of the following (in millions):
December 31,
 20202019
 Gross
carrying
amounts		Accumulated
amortization		Other intangible
assets, net		Gross
carrying
amounts		Accumulated
amortization		Other intangible
assets, net
Finite-lived intangible assets:
Developed-product-technology rights$25,591 $(10,564)$15,027 $25,575 $(8,322)$17,253 
Licensing rights3,743 (2,791)952 3,761 (2,398)1,363 
Marketing-related rights1,367 (1,041)326 1,382 (965)417 
R&D technology rights1,317 (1,065)252 1,273 (947)326 
Total finite-lived intangible assets
32,018 (15,461)16,557 31,991 (12,632)19,359 
Indefinite-lived intangible assets:
IPR&D
30 — 30 54 — 54 
Total other intangible assets$32,048 $(15,461)$16,587 $32,045 $(12,632)$19,413