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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 | %

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