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Goodwill and other intangible assets (Tables)
 9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
Changes in the carrying amounts of goodwill were as follows (in millions):
 
Nine months ended September 30,
 
2017
 
2016
Beginning balance
$
14,751

 
$
14,787

Goodwill related to acquisitions of businesses
—

 
2

Currency translation adjustments
25

 
13

Ending balance
$
14,776

 
$
14,802
Schedule of identifiable intangible assets
Identifiable intangible assets consisted of the following (in millions):
 
September 30, 2017
 
December 31, 2016
 
Gross
carrying
amount
 
Accumulated
amortization
 
Intangible
assets, net
 
Gross
carrying
amount
 
Accumulated
amortization
 
Intangible
assets, net
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Developed product technology rights
$
12,585

 
$
(6,624
)
 
$
5,961

 
$
12,534

 
$
(5,947
)
 
$
6,587

Licensing rights
3,275

 
(1,525
)
 
1,750

 
3,275

 
(1,300
)
 
1,975

Marketing-related rights
1,326

 
(895
)
 
431

 
1,333

 
(793
)
 
540

Research and development technology rights
1,158

 
(783
)
 
375

 
1,122

 
(704
)
 
418

Total finite-lived intangible assets
18,344

 
(9,827
)
 
8,517

 
18,264

 
(8,744
)
 
9,520

Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
In-process research and development
356

 
—

 
356

 
759

 
—

 
759

Total identifiable intangible assets
$
18,700

 
$
(9,827
)
 
$
8,873

 
$
19,023

 
$
(8,744
)
 
$
10,279