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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Summary of Changes in Stockholders Equity | The following table summarizes the changes in stockholders’ equity (in millions):
|  | Gilead Stockholders’ Equity |  | Noncontrolling Interest |  | Total Stockholders’ Equity
| Common Stock |  | Additional Paid-In Capital |  | Accumulated Other Comprehensive Income (Loss) |  | Retained Earnings
| Shares |  | Amount
Balance at December 31, 2017 |  | 1,308 |  |  | $ | 1 |  |  | $ | 1,264 |  |  | $ | 165 |  |  | $ | 19,012 |  |  | $ | 59 |  |  | $ | 20,501 |
Change in noncontrolling interest |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 82 |  |  | 82 |
Net income |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,452 |  |  | 5 |  |  | 5,457 |
Other comprehensive income, net of tax |  | — |  |  | — |  |  | — |  |  | 164 |  |  | — |  |  | — |  |  | 164 |
Issuances under employee stock purchase plan |  | 1 |  |  | — |  |  | 91 |  |  | — |  |  | — |  |  | — |  |  | 91 |
Issuances under equity incentive plans |  | 12 |  |  | — |  |  | 167 |  |  | — |  |  | — |  |  | — |  |  | 167 |
Stock-based compensation |  | — |  |  | — |  |  | 667 |  |  | — |  |  | — |  |  | — |  |  | 667 |
Repurchases of common stock |  | (27 | ) |  | — |  |  | (71 | ) |  | — |  |  | (1,996 | ) |  | — |  |  | (2,067 | )
Dividends declared |  | — |  |  | — |  |  | — |  |  | — |  |  | (2,245 | ) |  | — |  |  | (2,245 | )
Cumulative effect from the adoption of new accounting standards |  | — |  |  | — |  |  | — |  |  | (293 | ) |  | 483 |  |  | — |  |  | 190 |
Balance at September 30, 2018 |  | 1,294 |  |  | $ | 1 |  |  | $ | 2,118 |  |  | $ | 36 |  |  | $ | 20,706 |  |  | $ | 146 |  |  | $ | 23,007 |
Summary of Changes in Accumulated Other Comprehensive Income (Loss) | The following table summarizes the changes in AOCI by component, net of tax (in millions):
|  | Foreign Currency Translation |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Unrealized Gains and Losses on Cash Flow Hedges |  | Total
Balance at December 31, 2017 |  | $ | 85 |  |  | $ | 194 |  |  | $ | (114 | ) |  | $ | 165 |
Reclassifications to retained earnings as a result of the adoption of new accounting standards |  | — |  |  | (293 | ) |  | — |  |  | (293 | )
Balance at January 1, 2018 |  | 85 |  |  | (99 | ) |  | (114 | ) |  | (128 | )
Net unrealized gain (loss) |  | (17 | ) |  | 25 |  |  | 51 |  |  | 59 |
Reclassifications to net income |  | — |  |  | 4 |  |  | 101 |  |  | 105 |
Net current period other comprehensive income (loss) |  | (17 | ) |  | 29 |  |  | 152 |  |  | 164 |
Balance at September 30, 2018 |  | $ | 68 |  |  | $ | (70 | ) |  | $ | 38 |  |  | $ | 36 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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