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Major customers (Tables)
 12 Months Ended
Dec. 31, 2018
Risks and Uncertainties [Abstract]  
Revenues earned from major customers
Certain information with respect to these customers was as follows (dollar amounts in millions):
 
Years ended December 31,
 
2018
 
2017
 
2016
AmerisourceBergen Corporation:
 
 
 
 
 
Gross product sales
$
12,091

 
$
10,742

 
$
10,100

% of total gross revenues
33
%
 
31
%
 
31
%
% of U.S. gross product sales
39
%
 
37
%
 
38
%
McKesson Corporation:
 
 
 
 
 
Gross product sales
$
11,434

 
$
10,625

 
$
9,710

% of total gross revenues
31
%
 
30
%
 
30
%
% of U.S. gross product sales
35
%
 
35
%
 
34
%
Cardinal Health, Inc.:
 
 
 
 
 
Gross product sales
$
7,475

 
$
7,049

 
$
6,520

% of total gross revenues
20
%
 
20
%
 
20
%
% of U.S. gross product sales
24
%
 
24
%
 
24
%