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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Reporting Information, Revenue for Reportable Segment [Abstract] | Our product sales consist of the following (in millions):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Antiviral products: |  |  |  |  |  |
Harvoni |  | $ | 4,370 |  |  | $ | 9,081 |  |  | $ | 13,864 |
Genvoya |  | 3,674 |  |  | 1,484 |  |  | 45 |
Epclusa |  | 3,510 |  |  | 1,752 |  |  | — |
Truvada |  | 3,134 |  |  | 3,566 |  |  | 3,459 |
Atripla |  | 1,806 |  |  | 2,605 |  |  | 3,134 |
Descovy |  | 1,218 |  |  | 298 |  |  | — |
Stribild |  | 1,053 |  |  | 1,914 |  |  | 1,825 |
Viread |  | 1,046 |  |  | 1,186 |  |  | 1,108 |
Odefsey |  | 1,106 |  |  | 329 |  |  | — |
Complera/Eviplera |  | 966 |  |  | 1,457 |  |  | 1,427 |
Sovaldi |  | 964 |  |  | 4,001 |  |  | 5,276 |
Vosevi |  | 293 |  |  | — |  |  | — |
Other antiviral |  | 196 |  |  | 72 |  |  | 69 |
Total antiviral products |  | 23,336 |  |  | 27,745 |  |  | 30,207 |
Other products: |  |  |  |  |  |
Letairis |  | 887 |  |  | 819 |  |  | 700 |
Ranexa |  | 717 |  |  | 677 |  |  | 588 |
AmBisome |  | 366 |  |  | 356 |  |  | 350 |
Zydelig |  | 149 |  |  | 168 |  |  | 132 |
Other products |  | 207 |  |  | 188 |  |  | 174 |
Total product sales |  | $ | 25,662 |  |  | $ | 29,953 |  |  | $ | 32,151 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area | The following table summarizes total revenues from external customers and collaboration partners by geographic region (in millions). Product sales and product-related contract revenue are attributed to regions based on ship-to location. Royalty and non-product related contract revenue are attributed to regions based on the location of the collaboration partner.
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Revenues: |  |  |  |  |  |
United States |  | $ | 18,194 |  |  | $ | 19,354 |  |  | $ | 21,234 |
Europe |  | 5,311 |  |  | 6,365 |  |  | 7,528 |
Other countries |  | 2,602 |  |  | 4,671 |  |  | 3,877 |
Total revenues |  | $ | 26,107 |  |  | $ | 30,390 |  |  | $ | 32,639 |
Schedule of Revenue by Major Customers | The following table summarizes revenues from each of our customers who individually accounted for 10% or more of our total revenues (as a percentage of total revenues):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
McKesson Corp. |  | 23 | % |  | 22 | % |  | 24 | %
AmerisourceBergen Corp. |  | 20 | % |  | 18 | % |  | 19 | %
Cardinal Health, Inc. |  | 19 | % |  | 16 | % |  | 15 | %

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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