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Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 5,604 | $ 5,596 | $ 16,570 | $ 16,332
Revenues | 5,604 | 5,596 | 16,570 | 16,332
U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,219 | 4,151 | 12,110 | 11,781
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 871 | 975 | 2,908 | 3,116
Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 514 | 470 | 1,552 | 1,435
Atripla |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 149 | 258 | 472 | 921
Atripla | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 132 | 221 | 387 | 723
Atripla | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10 | 29 | 52 | 119
Atripla | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7 | 8 | 33 | 79
Biktarvy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,259 | 386 | 3,168 | 606
Biktarvy | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,106 | 375 | 2,868 | 593
Biktarvy | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108 | 11 | 229 | 13
Biktarvy | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45 | 0 | 71 | 0
Complera/Eviplera |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 93 | 139 | 331 | 528
Complera/Eviplera | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40 | 61 | 126 | 210
Complera/Eviplera | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45 | 67 | 179 | 279
Complera/Eviplera | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8 | 11 | 26 | 39
Descovy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 363 | 406 | 1,063 | 1,170
Descovy | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 256 | 310 | 735 | 895
Descovy | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 63 | 81 | 200 | 234
Descovy | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 44 | 15 | 128 | 41
Genvoya |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 978 | 1,176 | 2,973 | 3,418
Genvoya | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 761 | 921 | 2,222 | 2,678
Genvoya | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 152 | 203 | 522 | 596
Genvoya | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 65 | 52 | 229 | 144
Odefsey |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 436 | 423 | 1,220 | 1,150
Odefsey | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 317 | 323 | 865 | 905
Odefsey | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 111 | 95 | 328 | 230
Odefsey | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8 | 5 | 27 | 15
Stribild |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 94 | 146 | 298 | 507
Stribild | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 63 | 111 | 208 | 388
Stribild | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18 | 20 | 60 | 83
Stribild | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 15 | 30 | 36
Truvada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 721 | 757 | 2,045 | 2,174
Truvada | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 688 | 665 | 1,896 | 1,821
Truvada | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14 | 62 | 88 | 245
Truvada | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19 | 30 | 61 | 108
Other HIV |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5 | 14 | 37 | 46
Other HIV | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3 | 10 | 23 | 30
Other HIV | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1 | 2 | 3 | 6
Other HIV | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1 | 2 | 11 | 10
Revenue share - Symtuza |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 104 | 22 | 254 | 42
Revenue share - Symtuza | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 68 | 8 | 165 | 8
Revenue share - Symtuza | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36 | 14 | 89 | 34
Revenue share - Symtuza | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
AmBisome |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 99 | 102 | 297 | 312
AmBisome | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9 | 9 | 27 | 40
AmBisome | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57 | 59 | 174 | 170
AmBisome | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33 | 34 | 96 | 102
Ledipasvir/Sofosbuvir |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 124 | 311 | 542 | 990
Ledipasvir/Sofosbuvir | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 54 | 185 | 257 | 649
Ledipasvir/Sofosbuvir | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14 | 38 | 63 | 116
Ledipasvir/Sofosbuvir | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 56 | 88 | 222 | 225
Letairis |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 121 | 241 | 522 | 689
Letairis | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 121 | 241 | 522 | 689
Letairis | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Letairis | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Ranexa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31 | 178 | 205 | 581
Ranexa | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31 | 178 | 205 | 581
Ranexa | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Ranexa | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Sofosbuvir/Velpatasvir |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 516 | 477 | 1,500 | 1,513
Sofosbuvir/Velpatasvir | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 282 | 225 | 731 | 733
Sofosbuvir/Velpatasvir | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 118 | 136 | 428 | 502
Sofosbuvir/Velpatasvir | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 116 | 116 | 341 | 278
Vemlidy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 134 | 87 | 351 | 221
Vemlidy | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 78 | 66 | 214 | 172
Vemlidy | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6 | 2 | 15 | 8
Vemlidy | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 50 | 19 | 122 | 41
Viread |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57 | 70 | 204 | 249
Viread | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7 | 17 | 28 | 40
Viread | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15 | 10 | 57 | 72
Viread | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35 | 43 | 119 | 137
Vosevi |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 63 | 103 | 201 | 319
Vosevi | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42 | 78 | 140 | 250
Vosevi | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12 | 21 | 43 | 57
Vosevi | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9 | 4 | 18 | 12
Yescarta |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 118 | 75 | 334 | 183
Yescarta | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 86 | 75 | 275 | 183
Yescarta | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32 | 0 | 59 | 0
Yescarta | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Zydelig |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26 | 20 | 79 | 92
Zydelig | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 15 | 36 | 46
Zydelig | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 4 | 42 | 44
Zydelig | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 1 | 1 | 2
Other(3) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25 | 64 | 227 | 285
Other(3) | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42 | 37 | 119 | 93
Other(3) | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (21) | 19 | 96 | 75
Other(3) | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4 | 8 | 12 | 117
Product sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,516 | 5,455 | 16,323 | 15,996
Product sales | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,199 | 4,131 | 12,049 | 11,727
Product sales | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 804 | 873 | 2,727 | 2,883
Product sales | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 513 | 451 | 1,547 | 1,386
Royalty, contract and other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 88 | 141 | 247 | 336
Revenues | 88 | 141 | 247 | 336
Royalty, contract and other revenues | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20 | 20 | 61 | 54
Royalty, contract and other revenues | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 67 | 102 | 181 | 233
Royalty, contract and other revenues | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1 | $ 19 | $ 5 | $ 49

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