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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Stockholders' Equity | 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 |
Net income |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,355 |  |  | 3 |  |  | 3,358 |
Other comprehensive income, net of tax |  | — |  |  | — |  |  | — |  |  | 130 |  |  | — |  |  | — |  |  | 130 |
Issuances under employee stock purchase plan |  | 1 |  |  | — |  |  | 48 |  |  | — |  |  | — |  |  | — |  |  | 48 |
Issuances under equity incentive plans |  | 8 |  |  | — |  |  | 109 |  |  | — |  |  | — |  |  | — |  |  | 109 |
Stock-based compensation |  | — |  |  | — |  |  | 477 |  |  | — |  |  | — |  |  | — |  |  | 477 |
Repurchases of common stock |  | (21 | ) |  | — |  |  | (54 | ) |  | — |  |  | (1,526 | ) |  | — |  |  | (1,580 | )
Dividends declared |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,499 | ) |  | — |  |  | (1,499 | )
Cumulative effect from the adoption of new accounting standards |  | — |  |  | — |  |  | — |  |  | (293 | ) |  | 483 |  |  | — |  |  | 190 |
Balance at June 30, 2018 |  | 1,296 |  |  | $ | 1 |  |  | $ | 1,844 |  |  | $ | 2 |  |  | $ | 19,825 |  |  | $ | 62 |  |  | $ | 21,734 |
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) |  | (18 | ) |  | (6 | ) |  | 57 |  |  | 33 |
Reclassifications to net income |  | — |  |  | 4 |  |  | 93 |  |  | 97 |
Net current period other comprehensive income (loss) |  | (18 | ) |  | (2 | ) |  | 150 |  |  | 130 |
Balance at June 30, 2018 |  | $ | 67 |  |  | $ | (101 | ) |  | $ | 36 |  |  | $ | 2 |
The amounts reclassified to net income for gains and losses on cash flow hedges are recorded as part of Product sales on our Condensed Consolidated Statements of Income. See Note 5, Derivative Financial Instruments for additional information. The amounts reclassified to net income for gains and losses on available-for-sale debt securities are recorded as part of Other income (expense), net, on our Condensed Consolidated Statements of Income. Stock Repurchase Program In the first quarter of 2016, our Board of Directors authorized a $12.0 billion stock repurchase program (2016 Program) under which repurchases may be made in the open market or in privately negotiated transactions. We started repurchases under the 2016 Program in April 2016. During the three and six months ended June 30, 2018, we repurchased and retired 7 million and 20 million shares of our common stock for $450 million and $1.5 billion, respectively, through open market transactions under the 2016 Program. As of June 30, 2018, the remaining authorized repurchase amount under the 2016 Program was $6.6 billion.

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- References No definition available. + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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