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Selected Quarterly Financial Information (unaudited) Selected Quarterly Financial Information Narrative Details (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Up-front collaboration and licensing expenses related to Galapagos |  |  |  |  |  |  |  |  | $ 9,106 | $ 5,018 | $ 3,734
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (204) | 2,339 | 8,885
Net gains from equity securities |  |  |  |  |  |  |  |  | (1,200) | (115) |
Impairment charge related to IPR&D intangible asset | $ 800 |  |  |  | $ 820 |  |  |  | 800 | 820 | $ 0
Inventory write-downs |  |  |  |  |  |  |  |  | $ 649 | $ 572 |
Net income per share attributable to Gilead common stockholders - basic | $ 2.13 | $ (0.92) | $ 1.48 | $ 1.55 | $ 0 | $ 1.62 | $ 1.40 | $ 1.18 | $ 4.24 | $ 4.20 | $ 3.54
Net income per share attributable to Gilead common stockholders - diluted | $ 2.12 | $ (0.92) | $ 1.47 | $ 1.54 | $ 0 | $ 1.60 | $ 1.39 | $ 1.17 | $ 4.22 | $ 4.17 | $ 3.51
Upfront collaboration and licensing expense [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Up-front collaboration and licensing expenses related to Galapagos |  | $ 3,920 |  |  |  |  |  |  |  |  |
Intangible Asset Transfer [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (1,200) |  |  |  | $ 588 |  |  |  |  |  |
Inventory write-downs for excess raw materials |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Inventory write-downs | $ 500 |  |  |  | $ 410 |  |  |  | $ 547 | $ 440 |
Upfront collaboration and licensing expense [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income per share attributable to Gilead common stockholders - basic |  | $ 2.40 |  |  |  |  |  |  |  |  |
Net income per share attributable to Gilead common stockholders - diluted |  | $ 2.40 |  |  |  |  |  |  |  |  |
Unfavorable EPS Impact [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income per share attributable to Gilead common stockholders - basic |  |  |  |  | $ (1.31) |  |  |  |  |  |
Net income per share attributable to Gilead common stockholders - diluted |  |  |  |  | $ (1.30) |  |  |  |  |  |
Favorable EPS Impact [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income per share attributable to Gilead common stockholders - basic | $ 0.83 |  |  |  |  |  |  |  |  |  |
Net income per share attributable to Gilead common stockholders - diluted | $ 0.81 |  |  |  |  |  |  |  |  |  |
Intangible Asset Transfer [Member] |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net gains from equity securities | $ (929) |  |  |  |  |  |  |  |  |  |

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