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Segment Information - Product Sales (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from External Customer [Line Items] |  |  |
Total product sales | $ 25,662 | $ 29,953 | $ 32,151
Harvoni [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 4,370 | 9,081 | 13,864
Genvoya [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 3,674 | 1,484 | 45
Epclusa [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 3,510 | 1,752 | 0
Truvada [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 3,134 | 3,566 | 3,459
Atripla [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 1,806 | 2,605 | 3,134
Descovy [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 1,218 | 298 | 0
Stribild [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 1,053 | 1,914 | 1,825
Viread [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 1,046 | 1,186 | 1,108
Odefsey [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 1,106 | 329 | 0
Complera Eviplera [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 966 | 1,457 | 1,427
Sovaldi [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 964 | 4,001 | 5,276
Vosevi [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 293 | 0 | 0
Other antiviral products [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 196 | 72 | 69
Antiviral Products [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 23,336 | 27,745 | 30,207
Letairis [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 887 | 819 | 700
Ranexa [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 717 | 677 | 588
Ambisome [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 366 | 356 | 350
Zydelig [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | 149 | 168 | 132
Other Products [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total product sales | $ 207 | $ 188 | $ 174

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